Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5fa3ba308fbd762…

MALICIOUS

PDF

85.7 KB Created: 2021-07-16 06:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 998543099daef7cdc16cc563cdcefed6 SHA-1: 13f6a7603eab9b7aab0c79d3f5b3435c02c35cd5 SHA-256: c5fa3ba308fbd762ae9609790898e548b8a30b4f64327869a38c24d7df162d4d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites, likely to host further malicious content. The 'SE_CALLBACK_LURE' heuristic suggests the document's content is designed to prompt the user to make a phone call, a common tactic in callback phishing and tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://smidgel.ru/uplcv?utm_term=how+to+write+user+guide+for+software+application PDF link annotation
    • https://samsungdvmklima.com/upload/ckfinder/files/fulilajim.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/4727278493.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cc02050bc---33060216325.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1abbe091ac---57198493362.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/021rvsgtlfc5hj6m7lak9nnp03/domixarufuvegarajibalid.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083285d9f7fd---87135991297.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d65ce5b1fc---vujoke.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/51166880652.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/32734863154.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/032fd7cf2228c70ee0c0bd475b40f9a6/milogasalopotesefilabez.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a800ee0123e---93580756585.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/1111779910.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/0c69b59b05cf00bfe0c9471f6785c3d0/bivowokatatasud.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/fc9t670p49l8ir8ln6k76373g5/20394675052.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16080c9af80ba3---belazi.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/zomurukazif.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/moxakig.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///vunagojidoduxezobomik.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929e1c22fed---togujejubuwagi.pdfIn PDF document text
    • http://jp-cable.com/d/files/86221727735.pdfIn PDF document text
    • http://absigorta.com/E/file/53868156550.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/9363025893.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/domafe.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_off0000e9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E0 17620 bytes
SHA-256: 61c1b66b6de5722fda8ed2521418b532f5b5776167f050af5f2f0b748cdd7a0c
font_02_sfnt_off0001305d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305D 10972 bytes
SHA-256: 2052b11c71a258bda4e38fa201da8cb1903df98debea5d2d5bb796c55888fbab

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