Malicious PDF — malware analysis report

Static analysis result for SHA-256 a031e732dfc0a632…

MALICIOUS

PDF

69.2 KB Created: 2021-10-04 06:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5b4a92f8539b3d04a3bf7ffb065c16b2 SHA-1: cc530dfe2bf0aafdaabdf1b08bd55a6247cd6ad9 SHA-256: a031e732dfc0a63221ea6b5760dfb7642f6f6f6a1b46dac1fe2ea9aa981ce300
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Several heuristics indicate the PDF contains numerous links, many pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://brawlcall.jordanadams.com/ckfinder/userfiles/files/gepofiwufapoxinakevot.pdf In PDF document text
    • http://abnicum.ru/files/file/18437215361.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/58227898440.pdfIn PDF document text
    • http://live-net.it/file/91977247108.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/zatuleniserejedif.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210905/files/20210905092014.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/xosokit.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/kelimuvipapugoja.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/vukovebid.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109150915302699.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/su8ughcvtirfq69j2dpvcfmq4h/67380270083.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/pemolex.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/wijimobewagegotu.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/53719326816.pdfIn PDF document text
    • http://paliukenas.lt/i/File/piwibenawima.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161345c9a4e60c---72343685530.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/nebenuvozo.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109031657473743.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/buxil.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/gr9tms89kii9qi4376p7sd908q/wunarobevenisotun.pdfIn PDF document text
    • https://susta.vn/userfiles/file/81741677120.pdfIn PDF document text
    • https://sanmuabandoanhnghiep.org/images/content/files/bejobigerekolapudizavuboz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+do+you+sign+dog+in+aslPDF 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_off0000af25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF25 15392 bytes
SHA-256: 8d54b8a2e7349fc5093cef662359a8265f25168f36ad4066cf43af6515b14c5f
font_01_sfnt_off0000d624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD624 10384 bytes
SHA-256: 5b4ce149e7dc847dceffa9d5a758a151a5dc1a4f25b4546aa51cf7e8ae1a23f8
font_02_sfnt_off0000ed7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1