Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d4fc12bb81ca13…

MALICIOUS

PDF

81.9 KB Created: 2021-08-24 11:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 41fe2ac00337f8641c3f727eb98d7a9c SHA-1: 23e9218ff7805e3061accf39cd3ff56dc6d4200b SHA-256: a7d4fc12bb81ca13fe5cd9bf32762cc70ca53c5bba4a7228387cc0e2c43214d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various websites, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of link farming, likely to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=how+to+make+a+cool+enchanting+room PDF link annotation
    • http://unipsyclinic.com/userfiles/file/20210801103622.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/wedubozowifimexev.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/repemunogafetoram.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/cabbb5cb2021ae75527bb4ed50775325/xuludilipovovewugekula.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/20584337645.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086e9658670a---54112682446.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160942bb7ecde2---telivedewebapuwojawemupa.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0bce7c4db---62366288446.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/uni8jdgnbvo9rms9due1ddsf76/lafofajenefupujuxubeneru.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e7736e8d5---15262709721.pdfIn PDF document text
    • http://yuha.be/_files/file/kolosesaxilijubelenug.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/np1lh7ssvqvbd9ta2arjeq7tkm/84752887930.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/taralafulekulesifudemoto.pdfIn PDF document text
    • http://palami.by/images/file/56986750038.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/jebefidabu.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/mofadofuwutep.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/194cd440337a52fbabae144a13b87f7b/dipise.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/75198411604.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/56041290480.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/45619983142.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/koxidonogu.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca29fe9e88---30759208352.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/76342571515.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_off0000dd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1F 17196 bytes
SHA-256: 5f12b6c326ff5258921f886ba34aac02f78983ab8c24e38605014071f36715dc
font_01_sfnt_off000109be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D5 10676 bytes
SHA-256: 8fb5dc0870c7efa746b820750c154435caf4dd29f0863170b4f6bd0020e74ad3

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