Malicious PDF — malware analysis report

Static analysis result for SHA-256 30ce56ff793d0050…

MALICIOUS

PDF

70.7 KB Created: 2021-06-23 05:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cb0ee536e2ca8ba676103002e7804a4c SHA-1: 0d1f2576c6dadb89a693d0bf0a158ba4906b4a37 SHA-256: 30ce56ff793d0050e53f4b424b4438a20c34d323d9e4d40fb2598152ad7c3826
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external resources, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm used to distribute further malicious content. The document body, though heavily obfuscated, contains references to 'Form 1041 fillable', indicating a phishing lure related to tax forms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9344

Heuristics 5

  • 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
  • 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 http://edu-family72.ru/content/images/uploads/file/vigotojewelegi.pdf In PDF document text
    • http://yoron.net/up/files/22819078027.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa3c1958c3---nifevuzubadegoxukusifabu.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad8e2568e4---dudexofajubebomijud.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/27afc938650c1b4d511549d15fa9eb3c/betizobox.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/sixurivufapug.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b2c41e9e5---malutekexulede.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/2mhrn0vvr4ebv2j20m7vdi740e/buwaxetubezadumesajimema.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/39f21c4caedb8859b0f1a12be6b86873/79903135283.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805dcb9f7b3---ruzurimebu.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2ccd3889c---gurogabubu.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a5060187c401bcc8e6510cf7598a5418/69224398587.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d006d2521---bomesadabexun.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736ef8dc2fc---navavunupu.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5458d7fe9---80047540737.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/BkSY9tpko7c/uplcv?utm_term=form+1041+fillablePDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC85 4712 bytes
SHA-256: a8027ed6e7a524f737ae03f4343339f7eb1d5fc8045ed1f0e8709e2eccdd6257
font_01_sfnt_off0000ec80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC80 11216 bytes
SHA-256: ebf011d20ca750d24f15ef4f98adb472281af3b9c2088185d6a277f50d2ad4f6

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