Malicious PDF — malware analysis report

Static analysis result for SHA-256 5306a58677f19d9c…

MALICIOUS

PDF

81.8 KB Created: 2021-08-29 15:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 099e124138857bd5224a88e0a1e6d6a1 SHA-1: b0bc8eb0506928f556f3a709758a86b31f867ece SHA-256: 5306a58677f19d9c31480470a06a4449918db8decd69028a77483e3b2bbc5820
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress sites and disposable hosting, likely to distribute malware or conduct phishing. The embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/54dbaaf5e70dc918825d9405011c49b2/29732822401.pdf In PDF document text
    • https://imotrading.com/images/userfiles/36280193349.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/jomazisaze.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/51rus988tgb8a5ueak8lvs8klr/52047030376.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/19571276399.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cf2db4483---77671538629.pdfIn PDF document text
    • https://lesura.net/userfiles/file/73306966810.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/7bec34c4ffc019d53746ddabbc1f4a9e/210734258.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nunijikisapov.pdfIn PDF document text
    • https://reniuved.it/file/8005045706.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/73038239053.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/b47a6488d02b53b738c90f0f85183206/zokajomabaf.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087432be34b5---favezune.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082313fd9287---zofurunowitofu.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/bonuzikoxemebibijezom.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17b9e1ce27---15275875205.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/tukezanol.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/11931780362.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/54564372787.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/vonigujodow.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/ef08d5643b8f8c6d6f53ff37321da122/18633845774.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf463a1dc8---70088579681.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/buroluvigudosudoju.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6de0119d5f---xezakorijorop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+proof+of+residence+documentPDF 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_off0000da1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1B 10932 bytes
SHA-256: cd9f4ca623e96bca37cf8216aaf8bbbfbb929fc07a76f0f0eb26337bb1faecd9
font_01_sfnt_off0000f344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 17868 bytes
SHA-256: cbe6892b138a0fd90c355e145b3e629a9830aa89cab5a72d42c849772a848954
font_02_sfnt_off00012130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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