Malicious PDF — malware analysis report

Static analysis result for SHA-256 2842d3f661fff081…

MALICIOUS

PDF

67.8 KB Created: 2021-09-02 20:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7bdbad4a95db420228d896a5da5b327f SHA-1: 3b58d6e82aa3a28e344cd2cd686727e4e165ea0e SHA-256: 2842d3f661fff0811a2f3b3aee42a104b0823fd2c18e32268d8156e92bcb6134
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various domains, some of which are hosted on compromised WordPress sites. The document body, though heavily obfuscated, contains embedded URLs and is associated with a callback lure heuristic, suggesting an attempt to trick users into initiating contact for fraudulent purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pixomot.ru/uplcv?utm_term=dbms+manual+pdf
    • http://whewfamily.com/clients/12004/File/11864493773.pdf
    • https://pasarantogel2.com/contents//files/80022979617.pdf
    • http://codemessaging.net/ckfinder/userfiles/files/wujipesatobajatowale.pdf
    • http://rld-carbon.ru/file/20925472641.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae03b060a1---nejifazuruzozituro.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8ef2b6e8d---ribesosikutimamugemiz.pdf
    • http://liebherr-tr.com/userfiles/file/8897106823.pdf
    • http://fine-cottage.ru/userfiles/file/kibewoxanebuxefotolukuvi.pdf
    • https://tenshinorchids.com/FCKeditor_upload/file/5834326660.pdf
    • http://www.medicellbank.com/userfiles/files/zuwinodedoxonaf.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a07f972d9---tanewix.pdf
    • http://liebherr-tr.com/userfiles/file/siganukivorakonavetir.pdf
    • http://pinzimoniofiumicino.eu/userfiles/files/pudim.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/eh8rafrdqe3n2l7fel7off8nh5/16681598594.pdf
    • http://www.ecvbrass.ch/user/web/file/gulaf.pdf
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/30716082132.pdf
    • http://alnadaoil.com/userfiles/file/482362741.pdf
    • http://cn-noah.com/uploadfile/file/lumowofiwofirume.pdf
    • http://bjjiffy.com/upload/33870996127.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16077a9de10603---dupadimoruzus.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_off0000ae41.bin
a8ffc6b449e03ea771867fb3559cf27bd86aa341773340aca9909cb0f950f6a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE41 10356 bytes
font_01_sfnt_off0000c55b.bin
3d10c931b175bacbff3576a45c5f9fa8bc9d4050460a82343a3a3a778115175f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC55B 14708 bytes
font_02_sfnt_off0000ea17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA17 16792 bytes