Malicious PDF — malware analysis report

Static analysis result for SHA-256 0643058c2b3ffc46…

MALICIOUS

PDF

85.1 KB Created: 2021-09-06 16:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 54120f58987aec5aaab4bfa925c15eeb SHA-1: f5236a487d60be522fc24d7576e1b1c948f4cc30 SHA-256: 0643058c2b3ffc4665b190e71b4c03894c751f1ad00c7c5d30c3df5b01c22d57
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content or exploits. The numerous external URLs embedded within the document suggest it functions as a link farm, designed to redirect users to potentially harmful websites. The presence of 'utm_term' parameters in some URLs further suggests a phishing or spam campaign context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=frisch+waugh+lovell+theorem+pdf PDF link annotation
    • http://waypl.pl/upload/File/rafogotetagakukoxoduge.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/3e50cd525de1d1839d4ca3e399efa661/97991943915.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/fovitekiguras.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/58408784194.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03e2977cbd---dopipalojukow.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/lemezavufimuxifetagiw.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9444dd2df26d9aafe8d35a69994969a0/93010174516.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/85585593628.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/kivudibapexosep.pdfIn PDF document text
    • https://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/97844976525.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/r41fvh02v17fuj5f33r3o43ts4/96615723060.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/47627306260fa0da41194d.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e46026b3768---67479854044.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab92f710c56---13428595816.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/f03ff4f1271620ec907ccdfb7fa14826/kovukisikijajuwulo.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/15108720850.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/0a03cbd79889dce2cac14c1194cd5da1/jeboditawazuneremak.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/wexavukakat.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607749b280ac5---ferixenidegorudomagow.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/biwojibuxox.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/77495793543.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/732963632.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132f1b2a55cc---vegiwenetadokativ.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/53706947298.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FB 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
font_01_sfnt_off0000e1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C8 11192 bytes
SHA-256: ab5779069146c80fedafd47b2d65821916027e1d0547867b1c6ea926236073a1
font_03_sfnt_off000113da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DA 19352 bytes
SHA-256: bc64fb1da2d16dacc54c4678686195436e4eaed3183d0fb45a10aab41850f11e

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