Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0794a604a8d2ba9…

MALICIOUS

PDF

110.1 KB Created: 2021-07-29 23:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 67a05f227c86c493b98c26ba2fe1aa0d SHA-1: d74fd905b18367e3e38920f796c57c9ac31e0d68 SHA-256: d0794a604a8d2ba9a713475aa65f24ee39c9b72f6ea3d4a74bfaa6ef0a3914b2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9842

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://allprintusa.com/admin/images/file/tepezipilenider.pdf In PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0f24cc24b---88503960263.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/nfeqkdj3doheh8frjcv842t7ps/81246962248.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/msuao2t969s7c9of15ff9tkld1/nigixuvozugikir.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a30ebd8ce6---58757140500.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/57813399642.pdfIn PDF document text
    • http://ciskmv.com/css/file/jaxagalapezobapad.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078fe7c1b466---borazika.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/ba22168a5a2e46b86772f55e04b1477a/robiwavazenepuden.pdfIn PDF document text
    • http://www.hmh.sk/files/articles/file/41346847756.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/79929b861d59a5a6f4231937198d743e/zilokurus.pdfIn PDF document text
    • https://paperland.bg/uploads/file/wubizimuvegixiluga.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2264a2c87f1efce745d1c2661ef8f48b/74153960656.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0328e8d23---76337623702.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/50869266178.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607f71d7afb28---juvipemuniwog.pdfIn PDF document text
    • http://biosite.ru/images/news/file/jolebexu.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609c32495160a---75577877012.pdfIn PDF document text
    • http://le383.com/uploads/files/nuxawiz.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ok0o0oi1tdsu10vvf8r8g23114/xakepufijetupetaw.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/78434144531.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/lapofapawomarerixogirimu.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/177bc3d89c51e00676caa62e4c5144be/tutonigiwulubunedakam.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/mabezozo.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b92d8cc75eb---jidob.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/xafaderoxapunaluxizemalol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=msf+basic+rider+course+handbook+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001448e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1448E 18168 bytes
SHA-256: 40d2368b574eedddb569471e43c92b351ae6eec997d1b8a6f0d6d5d79f104036
font_02_sfnt_off000160ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160CA 10840 bytes
SHA-256: 6aa0ff5a7302d78bdb19f0111ccf095aec2a29a8e17e993b6b6a5ee23e47d877
font_03_sfnt_off000179d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179D5 18312 bytes
SHA-256: 1442ca885c27fdef8b3e0f72bc742166ecc545c858e899d1a77bbd605b410b49

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