Malicious PDF — malware analysis report

Static analysis result for SHA-256 738e70a50e9b0d31…

MALICIOUS

PDF

83.1 KB Created: 2021-09-03 20:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f9c0bc4c6e8b5078bf45111328789a86 SHA-1: a8d2adc05bee1a77094a1ab2c6dc378dfd8f1078 SHA-256: 738e70a50e9b0d31764c6e25f8d706933dc6920b85b532246b12df49029553d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites, likely to facilitate the download of further malicious content. The presence of a visual download button lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=numeros+cardinais+em+ingles+pdf PDF link annotation
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/601e0f232dc61dc93e3d17887175ae07/34959595417.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/zuvuja.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/jilad.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf54eaef08---30467531588.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/fnv9aka75uqn8bppcibt0fge1v/webebevorimabozifukifiwas.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/lovadugabaxefifezejamem.pdfIn PDF document text
    • http://babyschultz.com/clients/72285/File/38734499946.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/koratebejixenubilonetota.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/2828997d6167f0e2c9a03b6e0234bf16/58059463983.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ad2711f33---rolakudibotek.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16241884410748.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/vugoronubipoxezunulegof.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128c94148c5b---guviwemalasibirisoni.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2eef14a6e---37619638992.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/ratigimewalagifajebetub.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/tozokilarasiboxa.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/gilafuponibosopenor.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/68846151076.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160836b1224455---vexufapilenezijesi.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/39928252686.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/juwibano.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/vefewusiba.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA8 21144 bytes
SHA-256: 58efc0a074760b2d8880cd4cd79fce985a024731cdeea80011cd35c1652dec5c
font_02_sfnt_off0001261d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261D 10944 bytes
SHA-256: 4a036ab0d456fc5be707e1bdc454348f84f0da5d5f5cfff4bd6db6c2c4022d39

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