Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f560a026ae94241…

MALICIOUS

PDF

72.4 KB Created: 2021-08-30 22:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 40cc4b02d81dbbf5c80c858ea807a82e SHA-1: e9aacd033243f41d60394e8cca14d0ba43035954 SHA-256: 1f560a026ae9424123e9a781b387d409ccb881dca8311df08dbdf0b0fc94a796
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself does not contain readable content, but the embedded links are the primary indicators of its malicious function.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/oshjaqc8p1igfjqpjjnt0iqfo8/158415429.pdf In PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/14515457144.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wezosevivufatixaba.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c06646def30---50466746739.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16090311ede06b---fasulibex.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834598c44a6---65671530797.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/lokule.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081014508b1c---bavodidavi.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/gukatutamogazilo.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/luriwofosoxasinetikejamig.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608010d001896---tafatimuxorimadefepigavu.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b889b32c4d---76341502765.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/jamono.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/xakagewoxile.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/92019219219.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/27c468673562fe0dac373d9f7cbbeb9f/metokudifajisus.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202154847424174.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/oelomp4a6fm1puq8m73le4c20p/tofixusepagorawifuxataze.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cad7d5376---suxolurejisijomulifej.pdfIn PDF document text
    • http://multifamilyfoundation.org/clients/3/38/38c33163524538bb895552046de0b362/File/rafotaku.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608de9218162e---fepovumozuduxelewanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=quadrilateral+class+9+mcq+with+answersPDF 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_off0000b7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFF 11072 bytes
SHA-256: 7a8e35a59b307877beff8e3cd92f8f6ea5fbd63e132c12daeb93bf72e193c3dc
font_02_sfnt_off0000e980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE980 16756 bytes
SHA-256: 60086fda505aebe14b27248102fcb06dccd5dc3cb9a0df4ba6e50d764084dd6f

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