Malicious PDF — malware analysis report

Static analysis result for SHA-256 80fbbae98f736ba8…

MALICIOUS

PDF

79.6 KB Created: 2021-09-18 01:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dede884e1eb464334344d1aedac9c7ad SHA-1: b64555f50498339c737780eda13674f67f8e50c8 SHA-256: 80fbbae98f736ba822334295305159192b3b5517ae695993c7981db3ae62c570
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as link farms on disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct textual clues but reinforcing the nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=pup+patrol+movie PDF link annotation
    • http://suamanhinhlcd.net/userfiles/file/wozofevezagemit.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/niwogilufaxikirape.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/nebijijejagasunezorufiv.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/55338671647.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/bepupadexunav.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ab6cc4f69---79572161502.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/13959950497.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/38133767323.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/wobijojuladufok.pdfIn PDF document text
    • http://domplus.su/userfiles/files/46653638249.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/sewegugoluxuxamujovotep.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/60841998017.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/nlaqa175riaq5s112p7or4plrbt1142j/98663574302.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b702e12eff---kesuzuwisekog.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/25212340171.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/vigusawodipoz.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/xituzijuni.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/70683769956.pdfIn PDF document text
    • http://mariancozma.com/_user/file/22719360568.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202191662094977.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/8360801253.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/16929615187.pdfIn PDF document text
    • http://arsvet.ru/img/upload/xanaxikivimukafar.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/kojexujexikibarufapupigi.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/77762054452.pdfIn PDF document text
    • 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_off0000d337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB49 18008 bytes
SHA-256: 9602793b17c531f409ccf50ec82627a2520fab1afc2aac8579d45e4db3ed1f55
font_02_sfnt_off00011969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11969 10308 bytes
SHA-256: 8487006636d48f302eccce3bb97ef832a17634c59bab7120f0cec1d88a159d60