Malicious PDF — malware analysis report

Static analysis result for SHA-256 8405d836f12afbae…

MALICIOUS

PDF

81.5 KB Created: 2021-09-01 00:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 658e453d0e0a19a83738e3171c2e03f6 SHA-1: 825ed95d5c2c7a15105318488d546588a8c170dc SHA-256: 8405d836f12afbae318741f9d43a8e5a891e433e11db709c38edeea75595e3d2
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload sites and other potentially untrusted domains. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or redirection scheme designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e98a3b423---fonod.pdf In PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d43ddd5a0d---moduwufujefizugos.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/16961511958.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/jokigob.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/popadid.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///35060741173.pdfIn PDF document text
    • http://guyfamilyreunion.com/clients/41950/File/38434142032.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/fufepabanogefabusuzaziveg.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/98734860091.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/c992f9f86def082949d2946172f83e08/40373230093.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/zuwipuduxefugilumigebu.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/39889543361.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/34276882214.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/h7f0s4d55vp5om3ta17f02mga6/xitadufimopikorisux.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/84631138423.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/40087489143.pdfIn PDF document text
    • https://petek.biz/resimler/files/23792853087.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/vonuwekatopab.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/8026963084.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/b36a8d4d6ac8d9c48f75abf4b99f02a8/luvamapig.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/59187305191.pdfIn PDF document text
    • http://henca.com/files/details/file/14049692765.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16075784d3b0f8---85943575028.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/4f3b903c3ba7269218b99dad36a80f38/37545428200.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1610dca0adc814---nifuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=8+feet+to+cmPDF 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_off0000ddef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEF 9936 bytes
SHA-256: a2cccfe19d3ac0cb6792d6cca3d2e6ff3bb988c0ae36aa76bdecc80d11764303
font_01_sfnt_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 17248 bytes
SHA-256: 7c0edc1e72e31c64b059759383e9ccd54640a8060d793448d2301120de38a8af
font_02_sfnt_off000120a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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