Malicious PDF — malware analysis report

Static analysis result for SHA-256 336ac6d9a29a6b0e…

MALICIOUS

PDF

77.8 KB Created: 2021-09-12 22:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84051ac5602559495e5cfe5466c0a63e SHA-1: 0ba4b7cbb4079d86f5890dfd58a38482efbe52a1 SHA-256: 336ac6d9a29a6b0ee4eb1c96ba443d926153c221895a89c6175271f751054fb6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable binary data, suggesting it's not intended for direct user consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://oniceh.ru/uplcv?utm_term=roblox+bloxburg+houses+1+story
    • http://bogaarchitetti.it/userfiles/files/35620857132.pdf
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/18687849975.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbb94e3266---poxolegirufitiwuvafede.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e080d19ed0---66222447862.pdf
    • http://phutungvespaco.com/luutru/files/tegobujave.pdf
    • http://shyjjc.com/v15/Upload/file/202199451488257.pdf
    • http://havefuntogether.com/image/upload/File/89788878360.pdf
    • https://sapporopools.com/contents/files/vowoni.pdf
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/galafusegizofugan.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16133ddbfea47f---65015772270.pdf
    • https://www.meditech.cz/ckfinder/userfiles/files/59677443301.pdf
    • http://elard-group.com/ckfinder/userfiles/files/paxovixi.pdf
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/35567576156.pdf
    • http://yotlist.com/uniformkontakt/userfiles/image/files/70814874823.pdf
    • http://tetobox-budapest.hu/uploads/files/12707736.pdf
    • http://flairpens.ru/uploads/files/58320403787.pdf
    • http://nollve.com/img/editor/image/file/7917055269.pdf
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/judosajarixemabubisenoj.pdf
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/vovujolalatekavebagape.pdf
    • https://mdteam.se/ckfinder/userfiles/files/jumejizop.pdf
    • http://bjerkelunden.org/content/files/userfiles/file///nufaremejogovenugi.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/07352e67f2cbdd1e1cdf7a15de39c565/15562258720.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_off0000cd72.bin
f74b65d329b6945bf012e772b2c979211e41de4e9c79faafad0216595c072118
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD72 17096 bytes
font_01_sfnt_off0000f9ae.bin
55cb1a912425478f023f66b4f50979c012050a25a247358435db2b508d26891c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AE 10584 bytes
font_02_sfnt_off00011227.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11227 16792 bytes