Malicious PDF — malware analysis report

Static analysis result for SHA-256 123bc589a004483a…

MALICIOUS

PDF

66.7 KB Created: 2021-05-06 05:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b81126a3e9b3eee6e0d952b84c81778 SHA-1: ddcb8c24db61da4fb36a3e218a0dc899601f826f SHA-256: 123bc589a004483adf134803e4d93c7ac5862a9c3127eb95113a1816a69970c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file, disguised as a worksheet, contains numerous links pointing to compromised websites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9680

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/1bd061876dccace8dc473945c8830e6e/posubegedupifugafele.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/f5b01f7444254e75e1f5e3a8c9e8c75b/nakekopigajilijoninelija.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/c9t5p3e6mkhdd47fcch3fdi2p1/77638997397.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/234f65d5ef9fbda41b65e9df8d1c2985/98713489256.pdf
    • http://softwarefactory.nl/images/file/83975955727.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abdf981c01---55212962514.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850718eb3b1---44893014440.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/9ebf7f962ec6807d587acca2d4b86bc4/75807008185.pdf
    • http://asiavent.com/UserFiles/file/%5C/48085237581.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093148d8cf35---41940370083.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/6d09dc02e79c575d08a22795e51d1e97/kaxuluti.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d995960a15---jifiregaruniniviju.pdf
    • http://aclamerica.com/customers/CMS-IMAGES/file/virivejunugovigomovip.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/769fec416aa95fcf6188dbe91bc83b42/zakebajoderujufe.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/04938e5a02669d02febc69a74ccfcc48/3280129696.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a94a918ecd---7061500996.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160713da6129a9---8006555157.pdf
    • http://brenno-tojestto.pl/userfiles/file/34062501712.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=proportional+division+worksheet
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3b5.bin
32edf195a4c1ae148b66a7763b3d1453768904141bbd3414a617a87ab402a01a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B5 5264 bytes
font_01_sfnt_off0000e5a5.bin
e41c233d87f989bdc01715d8d17cedfa61a55821af25a244bb76d03581e3a76a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A5 10300 bytes

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