Malicious PDF — malware analysis report

Static analysis result for SHA-256 b426411d28b32a70…

MALICIOUS

PDF

91.7 KB Created: 2021-06-30 00:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ef1162dd73ca1b59524f02bbbe89008 SHA-1: eeec5076d17faa70c1dc6e44300794ca5f5082e0 SHA-256: b426411d28b32a70fd7467c082de511305ed4220d04d89c9e9252efea1a620e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing operation. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://oniceh.ru/uplcv?utm_term=file+manager+for+android+tv+download
    • https://clifestyle.net/uploades/userfiles/file/505878149.pdf
    • http://garderoba.sk/images/_file/78866794808.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/73mam4clq61il8repi4mth9ico/mutomosasusoluf.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc541e3d8d---sobuminujad.pdf
    • https://opsclown.it/ckfinder/userfiles/files/37948315210.pdf
    • http://angarakshaksecurity.com/userfiles/file/turimafogageximaziz.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/d30935858eda9a72fdff03b64812aa16/namejubuvodi.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/7af6a87387c5bf59cc0b0441e36e4f91/13459742126.pdf
    • http://suapaiatuipelehakefamily.com/clients/80707/File/rozarevazeboxisuxafo.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06b0d53d21---39049488777.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c69e51717---jexukapopowasiwebulafet.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/bae83b6f5886fb2d99c7d0242ed5c38a/64920078300.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/kk2e1f43k5p691grtgsadv2crl/bamaredojenofuragedomati.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/7vcbo41mgdo9vskdbfcdd5014e/34681538515.pdf
    • http://rauvuonsach.com/images/uploads/files/84675514686.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607a235c2c8aa---jutekewebirewalop.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/90vf9f8nd38r396aeatqi703n1/judoxakelekadipufezetejir.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790ce2b8a39---15304748111.pdf
    • http://goldmustang.com/files/files/5947692292.pdf
    • http://aep-tc.com/cache/fck_files/file/11696642440.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEF 16792 bytes
font_01_sfnt_off00010600.bin
97e3f73a58ccdd4784c9ae1678d9f90717e6b6d0c87c36bf93adb8865ef65ebd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10600 16192 bytes
font_02_sfnt_off00011b88.bin
f0cc3d96c22f04de693cf7d8974c13ca75b502d52ba02ddd22ac50445a4c918f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B88 17272 bytes
font_03_sfnt_off000148ee.bin
1f48d411cf01408517ccf248f953062c1ebf1eb5cb306beb79542e5fc5d1306c
pdf-font-stream PDF embedded font (sfnt) at offset 0x148EE 10656 bytes