Malicious PDF — malware analysis report

Static analysis result for SHA-256 8567a7c893736de1…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 14:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7bb692e25cbec5ccf74f1ef39a17efac SHA-1: 26b3dcfc84c0e2a1891364729eb78e53d8518e5b SHA-256: 8567a7c893736de1f4e2a886fb39d22be00311fca6acfcc68a0660baa638b28a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a multi-stage attack where this PDF serves as an initial lure.

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 http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161321b3bcb193---jininiranigopoj.pdf
    • https://beltamas.by/content/Files/48211694747.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138cddbd8e08---degegoj.pdf
    • https://millinerandassoc.com/files/file/tosovekupajipoguraravofo.pdf
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/junumiko.pdf
    • https://niboparis.com/upload/fckeditor/file/1631719768_1.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1959453be83f02b46f365bf1354878e8/28911064547.pdf
    • http://deborahkay.com/ckfinder/userfiles/files/9035423783.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/vjk1b3hva0eh53fb5psfrbfddr/77822361425.pdf
    • http://cuacuonnhanh.vn/Images_upload/files/jopufikizofunerojijamiw.pdf
    • https://777mto.info/contents/files/30211362592.pdf
    • https://coebmsf.com/userfiles/file/95305314949.pdf
    • https://orrizon.ru/images/file/28022806284.pdf
    • http://myagreement.com/UserFiles/file/8556510005.pdf
    • https://didacostruzioni.it/userfiles/file/39012551773.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397a691777e---92399126633.pdf
    • http://taxplus.in/images/contentimages/files/jabarikuruliluwevavuwom.pdf
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/42380214458.pdf
    • https://lotteppta.net/beta/assets/file/xevoro.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377e4cb3d24---rexopuwamumisunatomanegap.pdf
    • http://skipjackpoke.com/ckfinder/userfiles/files/jokasudotopafuborovabor.pdf
    • https://santehsevast.ru/userfiles/files/30518870230.pdf
    • https://tannhatviet.vn/upload/files/momabibivigebulajamaj.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=u+free+game+gta+5
    • 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_off0000b22f.bin
eb95c969616ea9fb34dbb17ef1e891a43b2c62fdfe898c6963063fbf402d9c8b
pdf-font-stream PDF embedded font (sfnt) at offset 0xB22F 16300 bytes
font_01_sfnt_off0000dae0.bin
bcba82b0e3766af4b58bc8946eec7839b3851457bac240228c320a06b8fcc426
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE0 10168 bytes
font_02_sfnt_off0000f1bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BF 16792 bytes