Malicious PDF — malware analysis report

Static analysis result for SHA-256 0083c9b69f54bbae…

MALICIOUS

PDF

93.3 KB Created: 2021-09-06 00:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 425c775d1b077604f97d3dc1734124aa SHA-1: 7c84691b2951e77de35c0ec08c12a6a6e236402d SHA-256: 0083c9b69f54bbae414c703a89794991bc2ab8cac44220b88539f40546d10bf3
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to various websites, many of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing activities. The embedded URLs are the primary indicators of this malicious link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/b1v3bjccd4vor3ej1bhpdebe4u/zidinanojejuwenijamur.pdf In PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/tuwedadowilujekumow.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/wuxijesozalusitepofon.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612181439ca2f---57747409114.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/l7j31qm6lo5t10s2on1pvljh47/84534755593.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc337e112e---47794408157.pdfIn PDF document text
    • http://planetamama.ru/files/file/tiwuko.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/90a5e86e3ba94f38f877a289095ad49d/xidipusumakenajelokijitu.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/161028ae658017---2171396136.pdfIn PDF document text
    • http://fluorescent-training.com/file/mamenalodugi.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/66694427571.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/17799108056.pdfIn PDF document text
    • http://hydrem.ru/images/file/sekuwenonunenufaf.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/jenome.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/jixumuwusojarexaberuse.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/61236193075.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/pivixijun.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/7c5a214554ddf63832b39b28a8961dd5/26814025940.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/93513310721.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608621fb32fbc---56816805572.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160744451b3073---tawomekimupirinawo.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/78710666489.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/g6vc2bh55ocpvojam8huiah81j/70402473666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=adobe+pdf+reader+arch+linuxPDF 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_off00010491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA3 19124 bytes
SHA-256: 263567aac4194c3b24332c0d206f27a673fa0c041cfa6e429859c872c1860b48
font_02_sfnt_off00014ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF2 10776 bytes
SHA-256: 6969725eaf0eee0c3d273c2b642196a71b8cb3217fa673fbe5f78f9b7134b699

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