Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e3d2c2df2e90a12…

MALICIOUS

PDF

79.7 KB Created: 2021-09-02 04:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce9799f02707b98f4dc5488601084243 SHA-1: f4007629fa8e9b9606363202076c0d6ece4b5cdd SHA-256: 8e3d2c2df2e90a12eae9b4fa9eee64383914b23211aa1798beec6bb450c57166
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various websites, including those hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://sinproval.it/userfiles/files/73134210786.pdf
    • http://lideparts.com/userfiles/file/1624697227.pdf
    • http://vnationwide.com/userfiles/files/rolatonatudutefo.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/72e7f5a3338c3449835b906923b0a193/jegife.pdf
    • https://cam-ceeds.org/ckfinder/userfiles/files/folenatomo.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/a335e818d1259765d9f730df0c76d2c1/xinuwim.pdf
    • http://galsabino.it/userfiles/files/98613890421.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/g5h8vkd2g1509b8bf1efarp6oq/16654742810.pdf
    • http://spzpoz-zdunskawola.pl/upload/file/98443045712.pdf
    • http://vipnjl.com/userfiles/files/42606024923.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fc3748b7da---43203729870.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f50b9b151a---ropazonefavizox.pdf
    • https://aksukartela.com/images_upload/files/75615201718.pdf
    • http://dentalclinicbangalore.com/uploads/modigupanatobizetovenofev.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104fbade9466---91580994482.pdf
    • http://varosom.hu/userfiles/files/tobotifurizogokuludez.pdf
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/6301741801.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f772fb72569---ferol.pdf
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/welikazaributubojotuma.pdf
    • http://sllight.ru/design/img/upload/file/luxibatabiwenuv.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/6e553925f5fba8665d2696cc2345bddc/relidilizufoliw.pdf
    • https://norservis.com/files/files/pajebobewevar.pdf
    • https://sasalidayanisma.org/uploads/file/vifarulidozul.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079043224c4d---jegawofomates.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=imm+5710+download
    • 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_off0000d59c.bin
e6176be2b157cf76644db95c04da07dd3bfd0334c6941869b7e854c657f93fc6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD59C 17244 bytes
font_01_sfnt_off000101ab.bin
319d0504a8abf30ea821fda62ea62efc0d64034c52709fdeea4d1da664b12724
pdf-font-stream PDF embedded font (sfnt) at offset 0x101AB 10216 bytes
font_02_sfnt_off000118a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118A9 16792 bytes