Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2178bf1366646a4…

MALICIOUS

PDF

71.7 KB Created: 2021-09-26 05:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95a7d404856fadb0a83f704bacfbf1d2 SHA-1: d69053485e84e4036061bd8097d80be0b0537529 SHA-256: f2178bf1366646a4cb4d909c7ea15327cbcb04164a8ef036c6cb1fe8e82d7204
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of numerous embedded URLs, many of which are associated with link farms, reinforces the conclusion that this document is designed to lead users to external, potentially harmful, content.

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 http://de.ruben.pl/ckfinder/userfiles/files/pizozazuwuzonilekibiw.pdf
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/72053751288.pdf
    • http://cesarrodarte.com/userfiles/file/sadowoxixefonogodif.pdf
    • https://mptradingcompany.com/userfiles/file/bafebojejazobagi.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16149e95b79d24---28355173719.pdf
    • https://bostoncake888.com/UserFiles/files/lexat.pdf
    • http://furniture83.com/upload/files/91405745924.pdf
    • http://195exim.com/datas/files/daruxunitijetunizuzasu.pdf
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/guxemilufuporamiw.pdf
    • http://tg-focus.ru/userfiles/files/70259815304.pdf
    • http://flirdining.com/uploads/files/texazusapaselututoba.pdf
    • http://bayanairag.com/uploads/userfiles/files/fefakabojesagutezapob.pdf
    • https://condominiovillage.com/userfiles/file/13764835312.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/demewubexukomo.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/dopol.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412cab3375d---duliga.pdf
    • https://www.gico.ge/ckfinder/userfiles/files/safefot.pdf
    • http://jfac.kr/ckfinder/userfiles/files/newulameb.pdf
    • http://elai.kz/upload/2021/09files/210926074811186438nb4jp.pdf
    • https://cfbadalona.net/ckdata/files/56129092912.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db6d2a92cf---fuvefixabilob.pdf
    • https://firsatpin.com/calisma2/files/uploads/gapibexululo.pdf
    • https://tese.in/ckfinder/userfiles/files/mokezelokujox.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/80f86a52d0141a77a18f2e9a38bc272b/rajebikodowifix.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=gtunes+music+android+app
    • 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_off0000b474.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB474 16792 bytes
font_01_sfnt_off0000cc86.bin
9e0f02d11feb76c26c6565d0582942a1fc3e2359179b0881ccb34ae5182bdf19
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC86 17124 bytes
font_02_sfnt_off0000f808.bin
4aa7bc9f8077791e65623ccd3423e1c1d2f20d9a64f0a7171b4bfea439bf5424
pdf-font-stream PDF embedded font (sfnt) at offset 0xF808 10768 bytes