Malicious PDF — malware analysis report

Static analysis result for SHA-256 5473a432881df83d…

MALICIOUS

PDF

102.3 KB Created: 2021-07-31 00:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ef8b34fd4445a34019be2ab68563c5d7 SHA-1: b4788acedcdd769fff00feb5666b72ae9766fa1d SHA-256: 5473a432881df83d49bb2f8c1dd6647cd6d0804a4cfa26d3edfc398804c79547
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is classified as malicious by ML models and ClamAV, indicating a phishing or trojan threat. The heuristic findings reveal it functions as a link farm, directing users to compromised WordPress uploads and disposable hosting sites. Crucially, it employs a browser extension/update installation lure, a common social-engineering tactic to trick users into downloading and executing malicious payloads, likely involving JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9543

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cructi.ru/uplcv?utm_term=view+ig+stories+anonymously+online PDF link annotation
    • https://www.idd.no/ckfinder/userfiles/files/7185166908.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b212ebe77b8---bijerixamutimuwewarew.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb15d726e9---zanij.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/70614940945.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/k9o8vltplfhr007muhlcpkfq85/95158722810.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/bunuxupediwaser.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/79357525289.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/qte3cku7jc76959leg5tpktg7j/bowedani.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/jagoxozizuk.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/49113759874.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160bbff108745b---32412015229.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e80a077f0---70508622468.pdfIn PDF document text
    • https://bataretak.com/img/files/file/43497279899.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/149639889260a6540cb13f1.pdfIn PDF document text
    • https://protrialse.eu/files/files/wapebezedovojuta.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/lovadinirasuzelifugel.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec3e93df8ca---37421337533.pdfIn PDF document text
    • http://brukbet.com/user_images/file/xujix.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d725d48fb4c---bifudizikodito.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086b077d6fdb---22460392946.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160d5cefcced02---fiveka.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/robbi2oopaiij7p6nv4md752qr/96668251193.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/28591622738.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/da5294c1d8be14a2966c4ac5f6a89d2c/bowijimew.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/55243787320.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804a5fb34cb---93733908787.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10269 16576 bytes
SHA-256: ededcdc505a76ea1162c62ddf28533687b43150c69b062155d204280b898f50e
font_01_sfnt_off0001198d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198D 1808 bytes
SHA-256: 2ac64099bb04456490a7519605c57cf99298ecc7b0cda6d2d37e6c208fc8c052
font_02_sfnt_off00012216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2D 10720 bytes
SHA-256: 26e9e03cabc21f77e66ba9812f27d92a95c076cfafd513845513ee7aea3b7621
font_04_sfnt_off000152de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152DE 20108 bytes
SHA-256: 9bd3e2a0025937a12d9244a9ce76ea52dbd9d531d93c9cead78b21817655d3a9

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