Malicious PDF — malware analysis report

Static analysis result for SHA-256 7829c9e1d45fa719…

MALICIOUS

PDF

106.9 KB Created: 2021-06-24 17:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 0fd07770722563059719fd0c027f56c8 SHA-1: bcd5e2d6dc4ae00920367de3e09d4e16c567f635 SHA-256: 7829c9e1d45fa719895f138e80137a7ae9baf74af45bc2a9ab8e5d4c9d1700e9
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/b1b7c79615812f85e92590af381b7cef/15670661463.pdf In PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1vhd5rvhtoo009f2jrugolnd7/29290274211.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/e16aa92c7e83b73c212ee3a1850bf520/zigaso.pdfIn PDF document text
    • http://katachizu.com/img/news/files/tonilezenewa.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/361b9c8940b89f6b09a2c8334dde6ede/nurenokarobifitevewizi.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/36864926939.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc988255e26---56095884908.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/47b5d71752a9a6c4e7334c82ace26489/wiwajaten.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0fd323789---raridasabenimaba.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/623d10a0311e2ca8663606f961f0ea52/28890798203.pdfIn PDF document text
    • http://policylic.com/uploads/files/51909027575.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/ci5t2kbqegk4l5i58d3gti0c4e/67744919592.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/labojurosonalezelowalu.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/62905765c17684ffeb31ef2620c8a96f/ratamakureniborozet.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085aaf09eeac---vobonolo.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/f50ac870840cbd808a135a9830fe2e85/bevedopidemezorupogej.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/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=engineering+physics+2+marks+pdfPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16409 5792 bytes
SHA-256: 67b7ea4d4217ff2b5e690d9927b68642488b8c1d60dab1e5a7e1c61487c6d243
font_01_sfnt_off000177b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177B3 11328 bytes
SHA-256: 8e03d5036d1fba40ac099269f3ad15e318dc6792e438839a39285a893b503a19