Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a6ff2d9b1fa84e…

MALICIOUS

PDF

74.6 KB Created: 2021-09-07 13:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f10bf18d10795a09f84775cb3da05049 SHA-1: 796885dd23ca218e8a44a49891ea590ac54ca7ce SHA-256: 21a6ff2d9b1fa84e460d01404ef6593d35ecb2f39adc272b58f654aca507d612
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous suspicious URLs, many hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://irlanc.ru/uplcv?utm_term=simple+past+tense+worksheet+for+beginners+pdf PDF link annotation
    • http://oresteruggiero.com/userfiles/files/zitad.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f4f58835b---wuguwazabajeneseb.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/zagezudelelonexen.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/39523876318.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/lidojopegobodakubi.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ec1634f5---67721250775.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/1134850079.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/63056d7f137fbaf176536635f5ec0ec9/wuniwukarawi.pdfIn PDF document text
    • http://babamoleskine.com/files/file/nuxubenajisozutu.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1b10e3394---94698862436.pdfIn PDF document text
    • https://cargotavio.ru/files/file/25889107033.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbfbef3d09f---wemave.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ac3bdd539---73226667642.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/35a9ecbb21933bc30405d2b247743bcb/pixovuwuw.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/0baab4cd5e749805a2374139972cbc15/tukopegedovudolez.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/1114899856d711233fe25509a61e8b80/12654460595.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5006efdb---nitesanunadisikamukapalu.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/qo1esp2doctkdrrub6gjlagk7s/fafidaf.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074101be080a---nukokosepasurupixuf.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/monatasosisos.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_off0000c08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC08A 11336 bytes
SHA-256: a8f22761f2b7a3241ab2e88425710b439d1001405867c3ba9266e5843df49c84
font_01_sfnt_off0000da95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA95 16336 bytes
SHA-256: 1bd3776223899279365226c6f1ba70b302e562f3c08a9a7773f493dfe19f868c
font_02_sfnt_off0001045f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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