Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f72eab86c06910…

MALICIOUS

PDF

75.5 KB Created: 2021-09-18 04:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a3e217b8599a8149d21e7b3b2070e45c SHA-1: ce5e1c0d623793df63adca6309ee59f45bbdd9e5 SHA-256: f8f72eab86c0691078408a29d186b2d1d8613cb741dd1c921c1c928bfd22c34f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised websites, likely intended to trick the user into downloading a password-protected archive, a common tactic to bypass gateway security. No scripts were extracted, but the presence of multiple URLs on compromised CMS uploads suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://anapharmata.hu/ckfinder/core/connector/php/files/28915302.pdf In PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/vrvmao5o5tfslp8o81tdq53213/19292050830.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/49502539211.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/mebupinosizituwe.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613615c602f27---930292343.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210915145524473678ev2tap.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/42328292059.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/toboza.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/demuze.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/75322842401.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/virilerevufapukotawilogef.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140140669dcc---gedula.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/82278664480.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/futaxotagekurora.pdfIn PDF document text
    • https://value.ae/userfiles/file/21023070517.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/zalunosurizokiwanuj.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/19248809824.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/53010783883.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/45919851321.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/68921536302.pdfIn PDF document text
    • http://maksimetall.ru/files/25153633840.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/79800168749.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/belilebidutajof.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/6998116560.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/bosekivegisom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=free+renegade+raider+account+generatorPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC55 10408 bytes
SHA-256: 0df4276bf4443ee3c3f80f9e457200feaa547b8ed57af3fca7ebd3327505cad3
font_02_sfnt_off0000f3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C9 17028 bytes
SHA-256: f2d4565391c322a6426804b5f82c626fe7b44da3cc881caa20156684cb301128

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