Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f3a18e264a28477…

MALICIOUS

PDF

134.4 KB Created: 2021-06-29 19:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8185e9955205c174e8e1d6492a297bd2 SHA-1: 65273516f9b4e56d8a5622d827b3a221f9464c4d SHA-256: 0f3a18e264a2847756928f99a92190afa600a71dd50772cf4a118ae476219dab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to lure users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://drafthe.ru/uplcv?utm_term=stale+food+meaning
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754a1814558---bodizenuxikimanevabafa.pdf
    • https://vieclamday.com/userfiles/file/45219131710.pdf
    • https://mfdesign.hu/files/file/vadupobemoj.pdf
    • http://m2m2design.com/userfiles/xevawuda.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/fa1563e9a601d428a72a931640583864/duzulowurobuza.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/u97bvjeukv10q9ivql25ajoc24/jadozagofegot.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aad42535ab7---wokoxopegatiritobawi.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/334011bfafbe13fedffb8b6e7e114fce/53107610729.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/saslrgnleddcttsgd9anl8sfro/suwematemaxub.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f35b0e047d---kodibawexiw.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/21efd3da3330f9e047c68cdf260ae768/20869030384.pdf
    • http://kashima.cc/userfiles/file/puzobalukapeb.pdf
    • http://pivotal-technologies.com/userfiles/file/62103080631.pdf
    • https://signika.pl/Upload/file/30337175960.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/g606t3h58d5cbh3425o1dq4cvh/76937672034.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/0ecbf1f3c5b98b9f583b030128ecde46/82474635502.pdf
    • http://zamokugrofa.sk/admin/fckeditor/file/27113127125.pdf
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/0dc97d689b4fe9f71234a5a3fe5178f3/gaseloxesutuzenuf.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091f1ab0d00c---59784141845.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/6704c8b4b8eb3745c9540e7f59d4e92a/zurumazaguruzumiziv.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609448b59032c---70623358006.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/0e5414d5502c177dd943936f68969d5b/wulovev.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/4m3d6k23317c1a8ooc3931mtoi/dakoxupitopupugedid.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ac4d.bin
94f7cfe47de3ccb94d81a4e02b16df215d5f6ed5eace4faade5ee77fb99371a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC4D 18516 bytes
font_01_sfnt_off0001dae9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DAE9 16792 bytes
font_02_sfnt_off0001f300.bin
3c86b9810b72aa83e55c7a155b3aa830d85af0aad4945af775e897ae7bcd8e43
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F300 10504 bytes