Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ea0384e1ecbb13b…

MALICIOUS

PDF

89.4 KB Created: 2021-07-30 23:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b60c7da82718210279cf2aa9d082791 SHA-1: 4bff1a0c35e0076ca4067f1d0fc3579eda8bbb39 SHA-256: 0ea0384e1ecbb13b31db862e28bc81c1e4f2f90b6519f5602cf943390e6e47c9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL analysis suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160effee07f29b---zilumobewudaxogitidulixin.pdf
    • http://sisparts.pl/zdjecia/fck/file/36395070606.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082b8bb3cd96---sosuvusavabefulolavixovum.pdf
    • http://kutyasturak.hu/images/files/14523510322.pdf
    • http://tate79.com/clients/868750/File/44104597283.pdf
    • http://jingkangchem.com/upload/files/piviligituxunoje.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/0dl3cf348h3a1vors238oesd15/6547938465.pdf
    • https://exxontel.com/file/fesezoforasag.pdf
    • https://dejavuruse.com/userfiles/file/tusateximu.pdf
    • http://kimdaiphatsteel.com/Images_upload/files/51321377840.pdf
    • http://onishi-kyosendo.jp/archive/97037127508.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ec878m4nfha55mdfrbtqk0b6nr/77670967921.pdf
    • https://copab.tn/216mag.svn/uploads/files/domupasoxapixit.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bfc5eb067---tajasaxikegol.pdf
    • https://www.myosiaffiliate.com/199trust/img/file/bugesusiwudirizavamaralot.pdf
    • https://akapacha.com/userfiles/file/zimubizisumovirezuwof.pdf
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/tubesibenamufogupiraku.pdf
    • http://pwr-tech.ru/userfiles/file/zosezod.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d55591ab9---gekugakulup.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607486e2ee55a---46733458877.pdf
    • http://vinmexindia.com/uploads/gobikiponep.pdf
    • https://amblamy.ee/upload/file/60288161458.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/c3262990852ad26ed8299eadbbfdf44e/91824807290.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=scary+stories+to+tell+in+the+dark+books+original
    • 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_off0000f82e.bin
e79905d2fbe453bc03a13642d63a6392e00a29f6112a553a11129695aa96c9c1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF82E 11068 bytes
font_01_sfnt_off000111a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111A9 16792 bytes
font_02_sfnt_off000129bb.bin
cc42db37917711c66fd4dc8bb433119486dd8a267d47e935a36be53ee89dd3b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x129BB 17484 bytes