Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3efa30f0c5f20c5…

MALICIOUS

PDF

62.5 KB Created: 2021-05-22 22:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: f5bec265ec92d9550e2703a69aa6de44 SHA-1: ac9ba0a5f2f9a6b6d35e3cff7dee4189acfe7ddd SHA-256: d3efa30f0c5f20c5598a68d51d7fb88073d0a7d07d24c8d8d879df589cc856f9
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised CMS upload directories, a common tactic for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be metadata related to the PDF's creation, not user-facing content, suggesting its primary purpose is to facilitate the distribution of other malicious files via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8152

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/i9er9kmotv88s0c7jarfrljk18/lokimi.pdf In PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607550a90df99---nelone.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/50qv3ojp89u7veheq43ih5vbn3/33841635578.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbdca582b7---tefulezur.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16095c9e05116f---lumulefopitoralazi.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cada2b8af---nedam.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/aa7oen279992cllb0gohovne62/98324455825.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/99f17b434ca42363238da4d3698d6f85/dizibomerijifexefevesor.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/d1sho2j4ppppdibbls8picc0ir/10610781919.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608620c0c25de---vilolovuzijaw.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/36406477800.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a8a2852c06309032e43a673a3674d630/64392283919.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/nupigalu.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/1fae2b72f7ff84d07e59864ca731846c/pudetiwoti.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/17ceb460a3d04d875e93747172b15e1a/fefakipij.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/9ec84f136d12a31cf187d5fa6d34dcc5/2885478400.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ca3cafeb8ef064108770364885276efe/3605404211.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=cosatto+hawaii+cot+instructionsPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F4 4852 bytes
SHA-256: 2fcd61ff6e9975fd2385f67d48c1ff6a080599d06f4a61881b3081205fd82c27

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