Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f118683eca0aa71…

MALICIOUS

PDF

84.9 KB Created: 2021-09-17 22:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d2639c778854c287b079f6d2f8264a13 SHA-1: b048caff58a6d8bc065a85c6fa7de949da39ec69 SHA-256: 4f118683eca0aa7107f6c55f8c2f70c3d1b102433855db7686b37a97809cacd0
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised or disposable hosting. The document body is heavily obfuscated and contains no readable content, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 http://discus-rus.ru/upl/file/13590211330.pdf In PDF document text
    • http://regmac.net/userfiles/files/24883351063.pdfIn PDF document text
    • https://anakmeong.com/contents/files/pivoposolopimapivipigimo.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/29975861614.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/37126201495.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7bff3fff6---53088898478.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/kigevisopilil.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/41384222909.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/wutasapazunudotudol.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/26994660926.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/56145547735.pdfIn PDF document text
    • http://kammed.com/userfiles/file/85702048647.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/02o6hc9smffhvsnb54t0ka8ri3/55526565430.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/liwufipixowagi.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/36898296228.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/d72ce0ba3b79369775d62f7b16932e87/wojusixizegenobidasur.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/7492c887299d9f778a6e171603ba76e2/zazepenupatip.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/5282140952.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134393c8cb92---40247619693.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/60735329433.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/89906497462.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/devesuwozudelobib.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85626413086.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/97110628068.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/pibinalodinubogujev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=read+divergent+online+freePDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE825 10472 bytes
SHA-256: 18aef84bdbdc42126a47a33e77c5d5ce41b9e0a1d001c89ac32d3840e91f02d3
font_01_sfnt_off0000ffcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCF 17600 bytes
SHA-256: d1d77a38cac403a9edede2d846ea2e0c4596c9628006491a09e986c13bc93e4a
font_02_sfnt_off00012dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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