Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1cb655520b6dd06…

MALICIOUS

PDF

94.7 KB Created: 2021-06-29 00:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9dc5feef6b561c108ceb278e36c5ee0a SHA-1: a8ccb4d3f3d0bffbbf6e90d192e3a17f747c0854 SHA-256: c1cb655520b6dd0613334177c1fd061db51cad776c690b4a0d502b73cea8d2c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers flagged it as malicious. It contains numerous URLs pointing to compromised WordPress sites, suggesting a link farm designed to manipulate search engine results or redirect users to malicious content. The presence of embedded URLs and the nature of the heuristic firings indicate 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://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/ho5qu0990kop2rnr886hjm08r4/52042420671.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdef0a0737---tijolutelum.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/84j04c5s36eleh4eo0o0u967c1/topinok.pdf
    • https://dialogueinpraxis.net/files/docs/vumekokaluvudokivid.pdf
    • https://casabresciani.it/uploads/file/gisebexe.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b856c92aa91---43011869038.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/5d515e3a854365fb71e43f8dd8ec8cea/sujusarejapamovixolo.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/qnbhgbtlsaubegd91med0lkakf/77101197162.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a84ceb07a6---zonadagevepanimizovete.pdf
    • http://tasarimak.net/ckfinder/userfiles/files/wumine.pdf
    • https://daks-96.com/f/uploads/files/dumavadesiruzugawuzizixaf.pdf
    • https://anandamsanyal.com/userfiles/file/nuwijel.pdf
    • https://sportcity.bg/webroot/img/content/files/13392322218.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a596169c265---saparipomogewilure.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ecd27c637---13366160342.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/b02p8q1eduhqlg6l3mb4sndb35/25055839194.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/c8a710acf57aa96002537a1b94be8db4/60721756089.pdf
    • http://donateagift.eu/userfiles/file/74069087942.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f7404799a80c5f74fa9a2239132b76f/47009293091.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cc35d3991---vinodi.pdf
    • http://www.jindatunnel.com/up_files/file/bolovupu.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/3akmh67g8p1ll7qvdp54b4h29g/woxizer.pdf
    • http://augustaelectricalwork.com/editorData/file/vibevowemijaj.pdf
    • https://gujaratisamajparis.org/upload/files/47476959669.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=train+to+busan+2+full+movie+indonesia+lk21
    • 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_off00010382.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10382 16792 bytes
font_01_sfnt_off00011b94.bin
52f851de94c7c18074f95919770c06a0606a8b5659ecac2d2abf200f40a113bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B94 25072 bytes
font_02_sfnt_off00015391.bin
f3bb7b698965d9e76de0336fbc5db5b44ef175d753ea54c873bac5a3d317a29c
pdf-font-stream PDF embedded font (sfnt) at offset 0x15391 11048 bytes