Malicious PDF — malware analysis report

Static analysis result for SHA-256 831f9a71965d1a3c…

MALICIOUS

PDF

93.5 KB Created: 2021-08-02 19:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b023fc74e694d76878d714889b9cd592 SHA-1: 2d071b2f9b908901d54d842efc19be33e80eecd2 SHA-256: 831f9a71965d1a3c225e140c166c29b15c9e3c60f6390695ba07848c72bd883b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting sites. The primary goal appears to be redirecting users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://mayjack.com/upload/files/54041296846.pdf In PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/08786dc88e6b7b8c0e7bdf801ce002be/fusajiligujitenisa.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6815007afa16444427dff3dcde0000f5/lisaruzoro.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/xoxegezekigolodefatef.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210525110249420992ngs6p1.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/35310005291.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/losamadu.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/murezej.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/mefedifofalipine.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/bovipomukubukak.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84ab329e0---31980755379.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e00108c6e---fagugetifer.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kuwixikax.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608357cb8a257---65304902768.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/xedurugarinozi.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/luditam.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb40473197---dowujuwunuzije.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/ruratolakar.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/462c62gbog3aajkjchm1a19738/55197315665.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/36127272041.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/bvebn9fe1svbm2rnu7ls95akl3/3727356698.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/kewaveberijolonib.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f716ec5078---matofaxovalivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+start+yahoo+dating+formatPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFC 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off0001213d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213D 17660 bytes
SHA-256: b8caccbd7726323f38b9381eac962af89212a89eeeaf6cc18d69dd685f36dec6
font_03_sfnt_off00014f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F6D 10812 bytes
SHA-256: fe5e879e6d5fd17af9114e5cc1b4e2760ea06906831c3b8602fc557d12f54224

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