Malicious PDF — malware analysis report

Static analysis result for SHA-256 6856f6ebeebce418…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 14:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b2f43738e559e989698997014e8b45c SHA-1: a553522b36e14456f1c575d135589c2a49ed9da0 SHA-256: 6856f6ebeebce418a39c71f8611da07d3ba5f378917facbdd890782d7d8d9bbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The presence of 'utm_term=vba+financial+modeling+pdf' in one URL suggests a pretext for enticing users to click. No scripts were extracted, but the overall structure and URL analysis point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/8b254aea3c8dc64fc69030b533817d34/jonazogojikoduwutokelov.pdf In PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/nabarifef.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/zeruzapotiruvejer.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/45443847528.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817ddb95811---xirevifa.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/50192139100.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/lawabuf.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/misova.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/1kqvqil62dqdtoe40ia00gt3bi/suvexu.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a1633c020---91243615989.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/jarelegisenijuligur.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ub68c5ebfvbvu9umtd2o4iolfh/tipabatefobiwomu.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608232707fc66---84037921884.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/nigorun.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/959d54eee549a8d375a6c36caa90ccb7/sobaku.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607236195ac53---luripenavobowotasulejewir.pdfIn PDF document text
    • http://idroter.org/userfiles/files/94984093716.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/70729755964.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/c6c524446ef3663f3674937c0650429d/pusuxapolupepisetolekos.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210706_4CE3FECB5FC3D9D1.pdfIn PDF document text
    • https://alutat.com/data/file/37436827943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=vba+financial+modeling+pdfPDF 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_off0000d90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF122 10708 bytes
SHA-256: 11ccc842799815b26d78bbe7217979b9602c1257e88bf69ece54eabad6d403bd
font_02_sfnt_off00010938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10938 17940 bytes
SHA-256: ef9e18e48e25a74dd26469e53d2b0169ca7e5613792184f629e5150f81ecfa61

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