Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e0582a6d21d13d6…

MALICIOUS

PDF

74.7 KB Created: 2021-09-06 14:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: feeebdea56010babad2edd6cd1a0ba54 SHA-1: 661353ab58da398428ee0096d7806140818bd4eb SHA-256: 5e0582a6d21d13d615e4992f447c48a16ef7e728c43e690daadbba7150f812ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm or phishing lure. The presence of external URIs and link farms indicates an attempt to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://smidgel.ru/uplcv?utm_term=zelda+wind+waker+walkthrough+pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/44828e1b9f67803904caaeed8e526afa/kutitike.pdf
    • https://whatproperty.ng/ckfinder/userfiles/files/xilivirud.pdf
    • http://chapelguild.com/images/usr/kexewexanumafumukiwapexe.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85ba0e668f---71288877236.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/8645f2635f5ea15fa6c7c57e088e8036/zavafofepiwatofave.pdf
    • https://triosms.com/userfiles/file/manuveje.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e720678a8---58625973731.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c96f6e2ee8---84322294633.pdf
    • https://zlatartopalovic.rs//files/46634007211.pdf
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/gipepasamowelutipagokawu.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/78m18jq3mo6mt9pia5cnkmm5b4/62723659738.pdf
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/28389502679.pdf
    • https://chungcungoaigiao.net/uploads/files/41743715564.pdf
    • http://homelife-superstars.com/image/files/futusoku.pdf
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vekitomeketoluweton.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086eb8bef9fc---61787168460.pdf
    • https://iveducentar.com/uploads/assets/file/2313761557.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161237a546f9d3---96518000471.pdf
    • https://alakharia.com/public_html/userfiles/file/fupajejitewiju.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/455d040d7fc65bfbc78467150b2d1878/nunuxamapibuk.pdf
    • 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_off0000c127.bin
4b38ca6832c26472b724c5460914f1da4f928597dacd151a9443793e457a05e5
pdf-font-stream PDF embedded font (sfnt) at offset 0xC127 10848 bytes
font_01_sfnt_off0000d9f4.bin
56a98a252a231e659b577fa6a0bb3aa36dbd7ef19d3ba785192e76de79307cdf
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F4 16768 bytes
font_02_sfnt_off00010532.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10532 16792 bytes