Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff2aabfe8aa87c1…

MALICIOUS

PDF

71.7 KB Created: 2021-06-15 22:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6b062dce00416277d432b4fd164dbe80 SHA-1: c0571eb2481df2afc3477ad8cf7be82fa57b1500 SHA-256: aff2aabfe8aa87c1a2a21d84e3ccc53a6ca1038ae13c63a3f011f66822435739
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The document body, though heavily obfuscated, contains a string that appears to be a song title, likely used as a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via the linked URLs.

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://catamma.ru/uplcv?utm_term=teri+jhuki+nazar+audio+song PDF link annotation
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/838a17dc55597f4dbaa1e43aec0563cd/lanedufominuwejila.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/96512843094.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/31ac654a6b568fb5cc68b0f245cbd605/63429007283.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2e12f2066---gadirubovoveboma.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/60215576548.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c84bc829801---kozunizit.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/jlnmrf3p4454q5j0181ril73u0/vesalamedoruvalizik.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9b385bf5e---dopalavosidan.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d83ec746a8---fonatijiroxezarugojesu.pdfIn PDF document text
    • https://tappowine.com/file/suxotigetipesuzu.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/577cb277d76fac8677064ae017170d0d/zegokazinimobemowoxo.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/puputadi.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3e5f73d01---sanidogawepukojif.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/33489139547.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/8a93daedf357e1f7e0c09e4d62c88373/bemakibovitu.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abba5909c29---watubegusemufelune.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/j858a3ul1e3echibh4p89l8oie/sazeduva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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_off0000dab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB6 5192 bytes
SHA-256: 50de32b8d74057de511797a99679c95778936339d44a7e5e17413b8e2206fd1d
font_01_sfnt_off0000ec66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC66 11068 bytes
SHA-256: b9c08fe2229d505a4dc29f73fb1799ee98dd3f3a278e1e9dfea126be075cd8cb