Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a0110e20859135…

MALICIOUS

PDF

85.8 KB Created: 2021-09-07 08:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a45e86e9b6e2881af8dbc9ace33ed4e4 SHA-1: 97a133d080f1f8cc1c73a8db172dba7f8afd795e SHA-256: c6a0110e208591355781f2b78cebdfe3f2ba3214a47dbb277ba13c1758d2b11a
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it's designed to lead users to malicious content or further infection vectors. The ML classifier strongly indicates malicious intent, and the structure aligns with a link farm used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://abc-tel.ru/data/File/7321205951.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f74a590aec---53229933576.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fa075ff4a---rubamusivorizogera.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f019ad436d---fazatipejufasixazurom.pdf
    • http://thevisionkharj.com/userfiles/files/tazininanix.pdf
    • http://hawkins-kearney.com/clients/f/fa/fa1934e8f236f3272fb98c88546bd003/File/13211497711.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e8a18a4fd---92721011968.pdf
    • https://szekszardportal.hu/userfiles/file/gejupulag.pdf
    • https://autotrans911.com/thread/admin/uploads/file/27851572833.pdf
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93063900992.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160749905dde32---rogibosunegutekimo.pdf
    • http://creationart.hu/files/file/80584564568.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d557cde4383---92897546809.pdf
    • http://newtarrytowndeli.com/uploads/files/44221431085.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/amlp62hkmvtih0sjeei36qit1r/wapozomerugetonofujuwope.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079869f67395---40146621982.pdf
    • http://isvpro.com/custom/files/buzudivesiripujako.pdf
    • http://konferencii.org/web/uploads/assets/file/97120960317.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/flfoq72vgj1io0h95ugaaa6lhr/41424315350.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d98e6fa9cfb---18239380873.pdf
    • http://www.aqsclimited.com/EditorImages/file/64925990090.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8afbda4748---91381581457.pdf
    • https://bibonatura.hu/ckfinder/userfiles/files/boveridesikowe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=production+function+pdf+in+economics
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/d6d44a08178c0a0a263bd83cc5791e19/92088319226.pdf
    • 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_off0000ed4e.bin
e223d512c0a6b881c5c3986baeac6276b0e7efb355c5e8cf4c267737eca4dabe
pdf-font-stream PDF embedded font (sfnt) at offset 0xED4E 16936 bytes
font_01_sfnt_off0001191d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1191D 16792 bytes
font_02_sfnt_off00013134.bin
fcde02bbac6afee9adcc1ae4c5001517a67520f21412416bc95501e7a5b36bf1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13134 10676 bytes