Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba27d4e5a2a0ab6…

MALICIOUS

PDF

73.7 KB Created: 2021-09-01 10:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a91c131b0020562a24bba2d5ecd499df SHA-1: efacbd6594a751c17ac0a8bf57a2c8d3d63950f5 SHA-256: aba27d4e5a2a0ab613708ce1bac329d50ab7c89562d65d47a7b6be7e9cca842c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by a ClamAV detection and an ML classifier. Heuristics indicate it functions as a link farm, with multiple URLs pointing to potentially compromised WordPress sites or disposable hosting. The presence of numerous unknown URLs suggests an attempt to direct users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://taevlingar.se/images/pages/file/25752131067.pdf In PDF document text
    • https://autoroman-service.ro/imagini_ws/wogajudokakupolanuvog.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/64881457627.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608255190013e---nokasuditijutodi.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee28ba69759---fidifezeku.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/93623884298.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/43910197949.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/nerowanenaxobagak.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/monabolasadef.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/c09eb9e7d919d7c72dfeaff027d770c7/21431431767.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/humrr7b306edud1gm8u872d5t4/37645639806.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ea542ce50---zajanebo.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/96546622147.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/ea1af7957b815a5ac85debda6929c311/jojojunonagukuredasivelo.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083654395105---najufeti.pdfIn PDF document text
    • http://sushi-belovo.ru/files/kawobiwujunisave.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/ea4303ceb190676d9a81e9d2feb1c179/85266367146.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/d9qgbtm5rkj1udmdn0o7jf4ht3/xenit.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/wimunipe.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/35320253678.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/36054662144.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/4a5f6e2aa1b9347604e59c2bb09d517b/kegokeguxowumejinel.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/f0f75e74de8be50129fe5a16fd1a5a41/27644070431.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c94ebaa95f8---84515320704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=stress+and+hypertensionPDF 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_off0000c0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E7 15572 bytes
SHA-256: ffd6d16846f5bc7d81a17281c96560af1c66d43c5e14baf159451621af1266a3
font_01_sfnt_off0000e852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE852 10632 bytes
SHA-256: bea049fc9808225c687adb14e3ba2a95133239dc3125e252fe5b57954cbb91f6
font_02_sfnt_off00010094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10094 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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