Malicious PDF — malware analysis report

Static analysis result for SHA-256 66be0a6a11565b75…

MALICIOUS

PDF

80.7 KB Created: 2021-07-17 22:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cd966ec342153bbb7911affce4a7c337 SHA-1: 532857492b30af374b1ef58118c4e3fcd1c743cf SHA-256: 66be0a6a11565b75bec3a92a3245574b18d113c3b121e27734ce754fc0e763a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for further malicious content or phishing pages. The presence of numerous external URIs and the compromised CMS upload links strongly suggest a malicious intent to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 6

  • 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.
  • 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://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/ec968046550902eede32a2bf5f6354e4/rawatutirenofoneb.pdf In PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e0cb238da---98327723702.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vutesinafoga.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/55689375568.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/54124813857.pdfIn PDF document text
    • http://naucseto.cz/storage/34216662514.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/gimubogurolagijebabegagud.pdfIn PDF document text
    • http://aven.su/userfiles/file/85660887919.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/ccs9pvh0n2ikde2dv0k64m9ip3/ludal.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/d5d95337fa7d166f9a6842c58195b9f5/biwuditukufigupetel.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/a4jn14eqt1cknhv1jpq2shrlbu/jovilemitinebemafo.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/3801385268.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/445bc5b87b2c8978a2b5f3695550ecfd/bevitoxape.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/72175369962.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/munutujasutubepe.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db7bf04ce9---63032240355.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee6f896c67---jijenuzoxaworuru.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/mowexapovizasefibirobipu.pdfIn PDF document text
    • http://technocom.pl/editor/file/magutuxe.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/vs4uahe42fbo0fnmrmcv2dbkkt/93134953962.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cbb070afb---fowegowelesopafeleb.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc7d95293f---43004829733.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/febc93c3ccd7f1ed036672d73954d4a9/kojifi.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088447da3710---nefagugimekekuwopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=kaplan+and+sadock%27s+synopsis+of+psychiatry+latest+edition+pdfPDF 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_off0000d013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD013 10948 bytes
SHA-256: 64ad152a559c771f01b725245da76b4534dcf8e91496b0578678ad9340b0e80e
font_01_sfnt_off0000e97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10188 1692 bytes
SHA-256: 05a06605bce74f3bc63eb763bc8427bb0c5e60e6742c9598e71a2419faecf71e
font_03_sfnt_off0001098c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098C 16568 bytes
SHA-256: 84366c8de7427dbb42a8c7b02f7472e24dcb07f4b808371fe972f5b4615e5759

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