Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef902c8e67b16c0…

MALICIOUS

PDF

90.3 KB Created: 2021-07-04 12:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f5eb047200e494a77c1199299e59d29 SHA-1: ab34f6635d510a2bbaf0992461a03e2b8f72a6c4 SHA-256: 3ef902c8e67b16c05c89f884be5d9ed9b5a6d5aaa502715099fd7ac2b4f749cc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/405u0lgt5863p4dgj17i21gng2/mirefovaduzopelerozuf.pdf
    • https://chokysitohang.com/Uploads/userfiles/files/kutemikaxotuwex.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/f50ada81985ca4b6d11feb4b711b7415/66106778820.pdf
    • http://tryinvest.eu/userfiles/files/rafasukokajupopovoxapeku.pdf
    • https://xo-sound.ru/userfiles/file/xubipemibekijubufatovevam.pdf
    • http://sweetbasketsbyjackie.com/clients/864293/File/26225898924.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a867de8ed36---27139650192.pdf
    • http://helderlive.nl/ckfinder/userfiles/files/zaxedefemekixe.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a9329a1881b6c56304b8c8bca2392571/38032888072.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/b62ebdb28b69346929efa26e8bc0b21d/3077704323.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/c256d5564a4a09a9a7488b1cfb714e7a/zurepuvuzoxoxemevu.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608764d3abeb7---36415114334.pdf
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/bulolurelarere.pdf
    • http://royalwedding.jp/images/blog//file/paditiwik.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/4894c988426f00f8328fc230d93936f2/buviwopagimisasonopip.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/e168a2cad6495e700ca2c78bb26ce6ce/79110012457.pdf
    • https://alutat.com/data/file/88143568799.pdf
    • https://vestol.bg/files/file/39717863574.pdf
    • http://littlepearlspublishing.in/data/eimages/file/raduwo.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f41e74a3e27d6ea5c79ed97b53275d30/87119694389.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c6bfb9cfe---fusubazapojuxebanija.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afbe418dde2---letijonidafejosuwatig.pdf
    • http://muzeumostrowiec.pl/obrazy/file/88390630630.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=past+modals+exercises
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fccd.bin
3aa6ff023a1aca8f8d5d70c8eb71242dd13c627772d3c9bd703d73871e2d5e60
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCD 10528 bytes
font_01_sfnt_off000114d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114D4 16792 bytes
font_02_sfnt_off00012ce6.bin
f50cda2f9836d3b78819987ef778377c5586ad7c36fb9e813d36764dff6f916e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE6 17636 bytes