Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67cb179535b7200…

MALICIOUS

PDF

86.6 KB Created: 2021-07-15 13:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 81ecd04153fd05faada3de713f893fd3 SHA-1: ee917f66a1bccd0884aa19b6645b7faadb482186 SHA-256: f67cb179535b72001f9f1449b7df0eed0faa54bce524fc76ac0fe54ba7d8ebd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous URLs point to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://sitpchemcieszyn.pl/_sitpchem/file/votovanawo.pdf In PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/upi9o7cb8a912n8cii690irdir/76729250088.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/78797680452.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/38359482045.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/49d322ef4f93ed05997122b0be4414fb/42681354595.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/7c49c27b594d0cbf6ebcd6afe4b3e27b/pizodutixadumipuvuzo.pdfIn PDF document text
    • https://aedwea.com/upload/foto/vigonidiresaz.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/86233713211.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/senip.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/dotosurakozerekode.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079952c57f60---dafewukofu.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/69273912766.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/jubipuvofotazidakaxi.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ikv1s74u6rf5f2p5kue0tq11tg/sanepore.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/ec07f7143eeb964af295e3edce6a3a57/nofaxewutugukibovud.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/67008dcf1ebc2d3192c399780901d432/dipimokadelusu.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/95765092456.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/rogutuvifeduwi.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7pcd3d5nip2dpla9gfdm6lmq34/6240427226.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/84612b480c3c544f25c30e2921e3eee8/48317201385.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/52282309028.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/d73c9b7b231064010a86872f63aaf70c/jezalarowisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=strauss+water+t7+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD212 18556 bytes
SHA-256: f787c667f1f59054643679bedeae0bcdcdfeeae0a840de379cc04096e0b5b09a
font_01_sfnt_off0000f047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF047 17108 bytes
SHA-256: d6885b48c16a8d1b523e5881e60eec076a32917559b01ff1f5c2e5e4b4ba24dd
font_02_sfnt_off00011cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF0 10368 bytes
SHA-256: 6fb8341a42c56c245870b59bd22ac6f387be8ddd75d5a9fbe9a5b8d7348f8b86
font_03_sfnt_off0001347b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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