Malicious PDF — malware analysis report

Static analysis result for SHA-256 17942489e8a661c1…

MALICIOUS

PDF

88.3 KB Created: 2021-07-25 00:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 31193f334fd5292d0ec59b3a83d3f44a SHA-1: cc50743efa571c08e07c1dfeb964a17c29974613 SHA-256: 17942489e8a661c1506326cecd457012838c1a0e07bcfbce22d9f14c9a41c601
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous external URLs, many of which host further PDF files. This structure is indicative of a phishing or malware distribution campaign, where the initial PDF serves as a lure to redirect users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16088fc0d9e5a0---36364513281.pdf In PDF document text
    • http://mini-garden.ru/userfiles/file/rujep.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210725050011_1210522835.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/fusirewe.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/nuvaduvexojupivawizekogo.pdfIn PDF document text
    • https://lordoptika.hu/files/files/10992182550.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5b15ae2da---gagexug.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/ed0hdsr569meh6bonrong9m2lk/rirozumog.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/37740a35ca8f9762cf670701700b8fd4/zonax.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b2311e06eb9---katesapukovegubep.pdfIn PDF document text
    • https://12tiga.com/contents//files/44129700704.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/n53flbmmu0sfg3vn427q954561/wupadatafegewifezomexemej.pdfIn PDF document text
    • http://lohs69.com/clients/82366/File/99890270972.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/4127a1c04338b364f648604635f13f62/23282556973.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/094a9cce46d4038bd0c5b443b13498fb/78798144912.pdfIn PDF document text
    • https://peterdegendt.be/file/61515759221.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/65461789187.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/70697924756.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/fetaxesejoferonoliraluf.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/e4f36f87ceb1e4790621bc5991c0aa74/3854292322.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16076793b2ebaf---ganetimadizinatu.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/nibavi.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/megesejuwujewafarezaxos.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/sitelejenaxebode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=watch+free+hd+movies+online+without+downloadingPDF 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_off0000f366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF366 11168 bytes
SHA-256: 6a6017c51b57895e2c3ed7ae3ebe78d6db741aaf960e5aa1787c44ea8df36bc4
font_01_sfnt_off00010d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D37 17572 bytes
SHA-256: 33c7879de3cbd4d1076909118ce5a5e0a90ce2d776d1369541fa34a2af9f1830
font_02_sfnt_off00013b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1