Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6419347ab15743…

MALICIOUS

PDF

91.3 KB Created: 2021-08-25 12:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 20d8b5aa36bc86d08e3b973c6e49544f SHA-1: f85bb431a99e4ca3690d127420dde3c680b90682 SHA-256: bf6419347ab15743492268b5352ecaa71914224fc32323e093363a2e11e335f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs suggest a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://synerhu.ru/uplcv?utm_term=largest+tortoise+in+the+world PDF link annotation
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c46f3878323d48f9578bc424e339542a/bupitadubitazenum.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610306e595f34---jomixuxafemadovurugebew.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/5qcgt73dhsqr3ii0u2kaqdtkb2/mesewojazosaxowezakize.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/wineves.pdfIn PDF document text
    • http://silver1979.com/upload/file/wajagazosariwuza.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/91e8a2e6ae12518c131b857b16369cfd/gezuseko.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/v85jec9tqj5p88rolhncsvv8t5/18745207224.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982b5c26ac7---68853861281.pdfIn PDF document text
    • https://kopari.hu/files/file/figivab.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/86306691916.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/77613447101.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/wesexadasifivo.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/56033426120.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/5c2d414822a7565965c304b14b6040e4/fubijalixizazoxi.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841bad10af2---nagapiboxasede.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b22dad21c9---kalagajijasavopodefune.pdfIn PDF document text
    • http://poliinc.com/upload/files/5689917137.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/73738966565.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/wavurane.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a750ec70a7a---binuxonupuwadeze.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/89268fd00549ecdb1524af35a14a0cd8/xilelomegomomap.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/mirabupulapone.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/sonuxixevuvusavusu.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_off0000fee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE4 18476 bytes
SHA-256: 3c11ed79038cf591115d53bebb2bb30c11e91326df306e6efb289447ab9d44b4
font_01_sfnt_off00012e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E26 10572 bytes
SHA-256: 6364e9b0d0ef16a0677065d0da148d759e14cd994d0408aae04e1749071a15b8
font_02_sfnt_off00014601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14601 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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