Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6a3680e4c4f626b…

MALICIOUS

PDF

82.4 KB Created: 2021-09-10 14:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f17da4f293fbfb098fa2362539cb8afb SHA-1: 62fc3fba35ab4135b3a2ebfed3c0f0d804a5488b SHA-256: e6a3680e4c4f626b45700340326b1145bed76c11579cda4a416f1cd0a2705000
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to act as a link farm, potentially to distribute further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pistant.ru/uplcv?utm_term=gta+san+andreas+cheats+apk+download+for+pc PDF link annotation
    • http://potlista.com/file/files/17789811687.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a873b841ab---86787883416.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ce60511bb55e491ac667421c5be5cea9/lodezetinetigixugodutodip.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613427f37f2e3---gadifuparafizusov.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/denuka.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16131520f754d9---4283394232.pdfPDF link annotation
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/738b94148544257cde37ce09b4a3f247/60384862559.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/32577390791.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/98398412686.pdfIn PDF document text
    • http://belean.pl/userfiles/file/40540210585.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/befivegawoto.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/85208021518.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5cc584778---99718780849.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/7618597708.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/23370410662.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/15905497355.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/jekonoditajatexononogelox.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/14439882806.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/lotenoponeromubo.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/norelulipitologejuledupa.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/16130748771.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/dezedisegami.pdfIn 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://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_off0000da32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA32 18644 bytes
SHA-256: 9f19800f8b55958aea318e0cd9d53217dc7daa9c4dab4267f9ad548c1d2b15ea
font_01_sfnt_off00010aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAF 10844 bytes
SHA-256: 9906324b98c9854dd14be2a82df58a81c3c6be089cf53be3b92bc35ae6075625
font_02_sfnt_off000123c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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