Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a68f3cff5714e65…

MALICIOUS

PDF

93.4 KB Created: 2021-07-07 21:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c47dc9fb230d26a651d9659866772f9 SHA-1: 48cb01d3a24235bc5ee7718bd7e5eeb4fba9a9f8 SHA-256: 5a68f3cff5714e6568344a03037bd7631f8f73e2ca3805020eb5e3ea26973508
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload directories and other disposable hosting, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://binarbaidequipment.com/public_html/userfiles/file/21053866825.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b085ac7aff6---26802441801.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ca6249aac2c---rugowimevanav.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/d5e33a0599fab4baf21962e54afab76f/53488164309.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/3cc2ba9d3dad7e9e9f499744ba6cc2ea/64060362922.pdf
    • https://cncostruzioni.com/userfiles/file/64780756459.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/e502952b5d311af53ba1dbc9e2922efc/81016628916.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/0ff6c7e78a963987aaa5b27d77253b42/tajawirimubekaparivel.pdf
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/50056727652.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/dcb27142cd6a62bdcad5f2e7ad3d6a12/vupajidunimewiveneme.pdf
    • http://springbook.no/files/gexabujogobarodekim.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a402c83cf---46008693766.pdf
    • https://publicbridge.pl/userfiles/file/zunerijudimavenafet.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b3edec4f04b90bcf8296af79e4c84a8d/36770202638.pdf
    • http://stark-tools.ru/images/uploaded/ruguzaluvotojoluvup.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16075b9fe8f6b0---26841418520.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/6opl4rv5s6a1eqskhpeuor7ead/47601344449.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4d79f3a97---45256925228.pdf
    • http://doo-san.com/userfiles/file/20210602232819.pdf
    • http://amy-tsai.com/images_express/userfiles/files/lewopex.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf131a04067---xobin.pdf
    • http://banghaija.com/userfiles/file/segen.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/sh22bbss0aj1m9erfde5mh93og/64786560928.pdf
    • http://tortsurprise.ru/upload/redactor/files/dasozerozik.pdf
    • http://top-conversion.ru/ckfinder/userfiles/files/90408266452.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16089143379033---bafededavevewogigori.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=father+and+daughter+having+sex
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f619.bin
7e3efcd8ae96210975faef6b93ecf8881197de1134fff8900741887c657194f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF619 10608 bytes
font_01_sfnt_off00010e15.bin
9485eaf6b6a2a23913faf37711c8449448f6a9a4c980adf76279853791ebe047
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E15 16660 bytes
font_02_sfnt_off000138c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138C3 16792 bytes
font_03_sfnt_off000150d4.bin
6be8c0c042521f5a71df7666660e0ab63b9e07567b17aa495b0122ea571483c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x150D4 16064 bytes