Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fab00bc965059c0…

MALICIOUS

PDF

82.6 KB Created: 2021-06-09 11:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3758ddc46b1c96f051ef6896976e848a SHA-1: e3912766b24893d6c4dd97a607c902d3cfefacd4 SHA-256: 3fab00bc965059c0410af85348ae71054740a0091aa03fae38bdb31259406618
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to be a lure related to a 'vacation guide', aligning with common social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://medvor.ru/uplcv?utm_term=chloe18+vacation+guide PDF link annotation
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/87778267413.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/77917411410.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7645865c4---35509427944.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8bdf2dbb6---64117663261.pdfIn PDF document text
    • http://abnicum.com/files/file/surefunirirejim.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/f067e885619f019fef14709550d534ef/tudatuzabufusevodakag.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/musofoputabib.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b44d4e0d6b2---toxamagimizonudofu.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c7502dd86---watijojiwulepogo.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/060ae47f4eaa9f7d747f37d0daa2d4a4/tifepurinukadaduvofexi.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/97b2c32266bbd76c1522e06fc26dcce1/nevefe.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/40010995465.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/niralinujadumokutajog.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/1d3a73d582c1787572f87dd1610593e8/98454878494.pdfIn PDF document text
    • http://www.asslar.de/downloads/balodufum.pdfIn PDF document text
    • http://chinalabware.es/d/files/79001567483.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/96567159614.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF655 3504 bytes
SHA-256: 09e0ecd499ae10edcc6a3a62e840d9f86a3f52b4f939f8ae5a69e3e96f95bf35
font_01_sfnt_off000102da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DA 5140 bytes
SHA-256: 3ac54f580bd91e45604e17ae9d869565ab348a9f01ae2489c44e15bd7436bd47
font_02_sfnt_off0001145b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145B 12496 bytes
SHA-256: 0b324adf6474a834917fc6c370c7bad2eb6eb83f74141660d85506eac5c88531