Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3be9d55462758f…

MALICIOUS

PDF

100.3 KB Created: 2021-06-27 21:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74ef87726f0e78b38c151927c5e22103 SHA-1: ea0a6da5e76542b9a4c2177eb19bc43c6959ced7 SHA-256: 7d3be9d55462758fef1b7091cebbbb5b22afe2efdc3c6ffd342522bd5b0ba9c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/2d0j5pd0vkq8lp4rlhb7esf62r/88262507112.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/jl62plnpitnpee1uv63d5l2rid/70021285119.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c966ee1f545---46909066532.pdf
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/47862737702.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/68291001078b7c2a83105dd10d85524c/xigeminem.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b436e68a63f---77678877421.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b96dd3a446---11567113241.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/1d2d7959fee1b47f57acebc6ab31c372/siduvilakomadet.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a64c0f42d11---xokiwisilogawovapafa.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a82dcbe55---vewapare.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5e72dc161---pomavasejabegerirabu.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/0cd9166c7d0f490d61e8f89c79497c39/40588080264.pdf
    • http://bitite.lv/media/txt/122/file/58095343892.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbfa6a1781---zokewidopoxovutatidekim.pdf
    • http://aqbnb.com/uploadfile/file/58572378885.pdf
    • http://strahovka66.ru/userfiles/file/zifugujadogiriluzox.pdf
    • https://mvpartners.be/images/uploadedimages/file/bazupuzotafa.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/59010n0o3053bahcuikiggeeue/98427929189.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/9iv7l2mjcegc46q9khcqn53ioo/28876628697.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4989dd321c---22464564034.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160baa5c801c14---bubakabosat.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/sikatera.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=does+it+cost+to+drive+up+pikes+peak
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001276d.bin
3ca17709bba544ae80973f130d7b68a27b362468dcff7fdcf02e4211b94668b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1276D 16824 bytes
font_01_sfnt_off00015369.bin
d5186221d4e58468cc2e02d6fd1e561debce47fc51787cd46ffde98cd3edd2c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15369 10616 bytes
font_02_sfnt_off00016be3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16BE3 16792 bytes