Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ed9c1ef0ddff6b8…

MALICIOUS

PDF

81.8 KB Created: 2021-09-27 13:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c6c76f1c15b10b93dcb06c3954048026 SHA-1: f232931fed55a9c840494043c0471aa76e29b2b9 SHA-256: 0ed9c1ef0ddff6b8e84130904528167b30e6be5a75cac699a4f579f71c47f4de
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 a variety of domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=insulting+words+beginning+with+g PDF link annotation
    • https://tavio.ru/files/file/21312633822.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/kalipuvet.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/dibowasotoma.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/lhq1085ehvqu9bolgbam56iise/82197202213.pdfIn PDF document text
    • https://stauber.lt/images/files/96131405780.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/41705899859.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/rizokosopugutozewavasutep.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/85195640896.pdfIn PDF document text
    • http://thegioioto.store/upload/files/panufojikusixafifewupaj.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/ruwonakawigaxida.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/ae43c710cd82423aab726380478e5000/34026475502.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/27780193422.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/28692121138.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613de89533591---kibukutetomevemuzidatim.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/17552953012.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/potasonebukasaxasexi.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/gimewubosetawakufegeruni.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/rixixagoreto.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/67521834813.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/9637034134.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/76763926968.pdfIn PDF document text
    • http://gyliver.ru/files/files/fabaruwep.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/telenobanivuwivorab.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/34419275436.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_off0000d228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD228 21424 bytes
SHA-256: 88735a4750eb7845172e8fd537240ba9657bfc541a02d0c094acbc3ee0e13224
font_01_sfnt_off000108a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B9 10640 bytes
SHA-256: df9b49b19f6bef74df00e81530779a1ecb89e2038302ae219aefe4ea88aeb985

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