Malicious PDF — malware analysis report

Static analysis result for SHA-256 c292d3fca024efa7…

MALICIOUS

PDF

76.9 KB Created: 2021-09-01 04:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb5b72f3b97c105c253afc4aaf8ae313 SHA-1: 613842913e618baec4d31917d78d7bd9c16077d9 SHA-256: c292d3fca024efa7a23a4e1ad9a5e8624cdc2843b7f590a9058590581a69b9d5
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs and link farms pointing to various domains, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links indicate it is likely part of a spearphishing attachment attack, aiming to redirect users to compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://oniceh.ru/uplcv?utm_term=fish+fingers+which+fish
    • http://curvesncontours.com/userfiles/file/91578750702.pdf
    • https://grouptm2.com/contents//files/31902019338.pdf
    • http://interface-referencement.com/userfiles/file/zujelusinekejikeru.pdf
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fosafedupivedikatuku.pdf
    • https://schlosshotel-murten.ch/userfiles/files/92256135995.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aef469997---safedonotorejawa.pdf
    • https://t2sc.me/userfiles/94380660693.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/4247da64ca75820add19f89eaff75d96/zafaginafapirowisetiti.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/d1a6445a6318ee87c1a0f0e68a4b6464/51788755884.pdf
    • https://elektrona.cz/files/file/39813735802.pdf
    • http://1carl.com/userfiles/file/41319720482.pdf
    • https://anandamsanyal.com/userfiles/file/5878179563.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/5f555e1a6c91c90dfdb8376d05d8b31e/17969634530.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ed3f278f5---25992028603.pdf
    • http://lexprikson.com/admin/style/images/userfiles/file/zibaz.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a1045c55e---81009968410.pdf
    • http://quincy.pl/ckfinder/userfiles/files/zukejed.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/331f6ff83ff09e2d30bcc4f21d4a58f6/zowevemunenatagogekifolun.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb4443a17d---kurewetaxumezujaji.pdf
    • https://masterjobintl.com/ckfinder/userfiles/files/lofaja.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/95e434aae5546bd45ab4614332ec8bdf/29412390918.pdf
    • http://dtmaso.com/public_html/Imagens/file/48700130475.pdf
    • https://oncallanatomist.org/ckfinder/userfiles/files/likojatufovejuzupejo.pdf
    • http://bestbuyfromindia.com/userfiles/file/63454041083.pdf
    • https://mfdesign.hu/files/file/buxaroxamo.pdf
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nurosimuzumo.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_off0000c9cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CB 16792 bytes
font_01_sfnt_off0000e1dd.bin
e9309c4858a7120b5306aaa381dc09325d48a5d0f049160220042fa0e65c02f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DD 17000 bytes
font_02_sfnt_off00010de6.bin
65d627d0d265bf13f22e550b2dc9f8a8144830e678ba4d8753e081cb14dfce4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE6 10252 bytes