Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd7386911f522df…

MALICIOUS

PDF

69.3 KB Created: 2021-09-28 22:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2fd0ec2450f86313499ba504cfdd6062 SHA-1: 8b04e5a4c46c4594d5f96aee1ceed54f6d038618 SHA-256: 9fd7386911f522df1bb7a60dbf5cdc285ad9e1f227c41ef4f03981720c037245
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised WordPress upload storage and other disposable hosting. While no scripts were directly extracted, the structure and URL patterns suggest an attempt to lure users to malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/6cacb17247087784c9b9239fbb348046/gawugoruvejekebigukot.pdf In PDF document text
    • http://wadsoda.com/UserFiles/File/26175579823.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/goxanopo.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/28204588620.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/88647802013.pdfIn PDF document text
    • http://chinalabware.es/d/files/jafabodevis.pdfIn PDF document text
    • http://jaqalsports.com/files/file/wawirexole.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/dudexazixedawizex.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/34837934283.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/81377343459.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/06vif3rg197fp91b3ud6iomgi4/64262887049.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/kuzewox.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/47993108201.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/4046015108.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/pupojubigek.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/repupinijepiv.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bd3368d0a---31060530204.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/salok.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8f29f42ca37ccc8a356d36e62bd6a6c6/51146780656.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/8750721144.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/69531277036.pdfIn PDF document text
    • http://jainfarms.com/uploads/14402814130.pdfIn PDF document text
    • https://kildevangen.dk/files/32726866506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=collective+nouns+class+5PDF 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_off0000b22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA43 10452 bytes
SHA-256: 7cb8f9058ae288a766f8283cd003c72ad925610bc5df186f1b66fec1f2a6cc9f
font_02_sfnt_off0000e239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE239 15028 bytes
SHA-256: 6d210fb06ccb33f699642d61b908d37cbcb2926b1cfe6d8b8c2de65b8a34a355