Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b165a5750014b84…

MALICIOUS

PDF

80.9 KB Created: 2021-08-24 19:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bbbfe2fee393e178dc05f94637c1cbfb SHA-1: 750b1587662a7dbc1e3f74f383aef1c27fd67afa SHA-256: 2b165a5750014b84ad3c4714aa30ffd88ad912ba671a23ab45bfe93b56d72a1c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rajskiewakacje.pl/userfiles/file/2481775998.pdf
    • http://aescantabria.es/upload/fckeditor/file///jivuwakisob.pdf
    • http://siltherm.com/ckfinder/userfiles/files/kifiwafizogovujotin.pdf
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/84470175508.pdf
    • https://pianotuningdarwin.com/userfiles/files/dezuvitozadija.pdf
    • https://pbchistoryonline.org/uploads/file/27082348985.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16118068130032---14168877518.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a756e125f---94687803910.pdf
    • https://toyotaautobody.com/ckfinder/userfiles/files/ladeguwovavefuwad.pdf
    • http://buffagiuseppeinfissi.com/userfiles/files/99626568272.pdf
    • http://akcjonariusz.com/UserFiles/file/42858956702.pdf
    • http://megaprestige.ru/uploads/files/fafumatubikavaduv.pdf
    • http://daltan.hu/userfiles/file/jasazebama.pdf
    • http://kvbm.org/pds/userfiles/files/76864903638.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be3c59b869---bubesim.pdf
    • http://metaglas.kr/userData/board/file/zujubefepijejafarovaduxe.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/3nk2ceojnjvg7i5par7pbqkuvc/7834106326.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/8vn9b5bjotdnhfhc6utlqi53bg/85614025281.pdf
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/zenogulijizoleli.pdf
    • http://wideanglepackaging.com/ckfinder/userfiles/files/ferebufajapexen.pdf
    • https://appvid.eus/userfiles/files/11253029278.pdf
    • http://levakov132.ru/userfiles/file/15933921139.pdf
    • http://nage-z.com/ckfinder/userfiles/files/13085905903.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/g3r3tv2onthd0fc4e19er93l92/sedopi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=what+does+the+phrase+provide+for+the+common+defense+mean
    • 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_off0000d881.bin
4fdf71bad626e28818875e84b9096f269e3ba653cb502a313dde427d163608fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xD881 17180 bytes
font_01_sfnt_off00010544.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10544 16792 bytes
font_02_sfnt_off00011d5b.bin
1e7333cea90695475b302b172c16153543a20152bd6a378f0390266d45c02a2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5B 10900 bytes