Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7812d60937094f6…

MALICIOUS

PDF

91.7 KB Created: 2021-07-15 10:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a77ffc1b06f9a47f82e3814c77cd8d7 SHA-1: 2bfac57b9a10dbd65381aea366e7d2ab8f7ed74d SHA-256: e7812d60937094f6cbba075cb6ac00596ca4fe37d57ff6a143088ff1f2f05cdd
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of numerous external links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160892056e3e26---14628199224.pdf
    • https://cgeminfos.ma/upload/file/ruwagatomud.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05592a467a---83770222885.pdf
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5042622502.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/625681143bc97ab575030821b07ff982/1602831204.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/dv8qi1pbcp6ues707466d1h7eq/14153338368.pdf
    • https://pypconsultores.mx/userfiles/file/durux.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/40e196d93bd9bca16e6d11445a6ca6f2/sozevevaxurof.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06bbb7040f---gamelukaw.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/af135b6c3adcd802e56787921d8201c5/11542644906.pdf
    • http://easternsheep.by/app/upload/file/bibigolorexegev.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86933a9bc4---rebinomudusapa.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/943ce1eb872b87870bc2408c523fac7f/73512977590.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607da845c33eb---47551435435.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160876d1864c59---67873369845.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05a9c181a3---vavupif.pdf
    • http://videofilm-tv.ru/content/File/16586503572.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0850b2ac40---gulorepaxu.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609492a01a237---61669734583.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/194e30a321ab518424bd9249c950851a/dofuxafipofukuga.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/a18df0d06d94ded89aaf76debeeb0c23/retemiretapexotipob.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ubculqfl5dhvhbvgdqg5kr1116/9212228925.pdf
    • http://rebornfair.com/FileData/ckfinder/files/20210615_337229CD3A12141F.pdf
    • https://tosto.cl/ckfinder/userfiles/files/26370034508.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=gated+community+meaning
    • 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_off000101cc.bin
4a178d3555edc10e6ec3c7c2db0dfe7e961f20cf5fb930ef08b0beb59d58ae8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x101CC 17976 bytes
font_01_sfnt_off0001316e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1316E 16792 bytes
font_02_sfnt_off00014985.bin
fadbc0443052dbcfed6bd47c0cd59ca51dbbb12d684fb86c5b0e24a1ed0ce309
pdf-font-stream PDF embedded font (sfnt) at offset 0x14985 10652 bytes