Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5146050621aae1…

MALICIOUS

PDF

79.0 KB Created: 2021-09-02 06:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 94f343d0eb967dedb91e059b4cbcdaf5 SHA-1: 00dafc0ef56d875c7f923b3c020978f854cf9784 SHA-256: 9a5146050621aae1adbf2b0357f59595151a312d478e773631e44d5b2aed5dd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains malicious content or exploits. The heuristics identify it as a link farm, with many URLs pointing to other PDFs hosted on potentially compromised websites, suggesting an attempt to manipulate search engine results or distribute further malware. The presence of multiple PDF files in the URLs indicates a multi-stage distribution or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://encoyun.com/calisma2/files/uploads/55952180566.pdf In PDF document text
    • http://bindashnews.com/userfiles/file/81838067031.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/dfa69c9cfeb43e9904b92d9b35f1fa23/ronomenavisanaro.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/betezen.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/7d2104bf8926b56dfa05864317ef96c2/fojugejamifumawesur.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/gilolofiroxutumili.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/c4c62bb025ed292b2831672ef2a1cf91/95213736707.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/9a6a50f734557fc7488b3ae06ac774f7/15469061401.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/woramovadumu.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d7ec5efe1---16221722038.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e2cb26c0147d5d6be7d70e31d14c2d9a/71738633272.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070371ccab64---88808968818.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/36367ef0cd3bc414e3279e86589b6949/fotisavofu.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gekisifumerajafometuduj.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f378681b3---koroxalalepevogu.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/75493190323.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/bsg9r0992grgfegsl8p9ke9020/23151849287.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/31730950771.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbe7e5931c---62641198512.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/pazefodagajenijemab.pdfIn PDF document text
    • https://robertbah.si/files/file/monatezalifomutituwuzupaw.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/budekemobebivuwotojefufil.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/p144oq5o9rbagm0bm7v52tab36/rubokufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=its+a+girl+thingPDF 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_off0000d27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27F 10088 bytes
SHA-256: 0a456f4311d6ee35ce3e012d69e6fb11a4d338369d9507ccd552ca972262cd10
font_01_sfnt_off0000e8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CD 17604 bytes
SHA-256: b16845796d32aef04027bb7d4918db4b70b0d5cbcf4d5ed333277b4fc2dae82a
font_02_sfnt_off000116fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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