Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6746b05c509794a…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 21:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6b50eb6b626ab6008df6cf3c554c7686 SHA-1: c02af2281dc54e47941aa87bc9cd65a32a4c3062 SHA-256: e6746b05c509794aae4c0abcbe04ae3c432b9bdf74717df73fb0889a0d84f5e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous links to external websites, many of which are hosted on compromised or disposable domains. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates a likely phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall pattern suggests it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://catamma.ru/uplcv?utm_term=harry+potter+music+mp3 PDF link annotation
    • http://5thaveseniors.org/userfiles/file/72386877803.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/roxalakafogijefupegagari.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/86551693125.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/97244307791.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/lu44a28n0h1srpcf31g3usnoal/fozivivej.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/31909396126.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/e1cf056198498a8064e1151321532cb2/54030226290.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/kapidu.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/duwozadabuteberoz.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/zujafozavakewamuvepenigo.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/53023761309.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/rolomamojamovuleroxa.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/41295024383.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/nujezalivovotoj.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/xesokavuxobifoziziw.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/76233992956.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/jukigifuzoragitinuzak.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/sibuw.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/nojexa.pdfIn PDF document text
    • https://aromamarketing.md/img/files/buwaputuxanemal.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3a489dec7---dadis.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f25c7bb2fe---19150639952.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/razanigowat.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/68620823560.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/50078253737.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/17524948204.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_off0000dd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD70 18664 bytes
SHA-256: 46236a7e48abf098cac41b861cc9b0a22772e44c4ab655f2dbfa7ee6eec5380b
font_01_sfnt_off00010d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D96 10764 bytes
SHA-256: 52ebcbdc28bf6e7d8ad7e95ff10a8a4829564d7c8fada62989e4645ce636a566
font_02_sfnt_off00012677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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