Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f58d1e2c6f823a…

MALICIOUS

PDF

72.1 KB Created: 2021-09-22 14:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52cb359398ac15aa503e52d765f70f6a SHA-1: ef7180fa0d40b16dd37a36a5bc5a71e73cb89cfd SHA-256: 19f58d1e2c6f823a8e583c30b5f307990e9fb3d4dcab0b0f3f5db0a84c10b0fa
156 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs indicates a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://seghers.kr/data/editor/file/1868339999613adf5eb8f58.pdf
    • https://sydneystudytour.com/accounting/userfiles/file/94823808261.pdf
    • https://sitpchemcieszyn.pl/_sitpchem/file/fexixarukenede.pdf
    • https://soalmatematik.com/userfiles/file/45966487318.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161499525d1474---paxawu.pdf
    • http://kpotplace.com/uploads/files/wefevatexunenaludibivi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fc7766194---78176289953.pdf
    • http://siripanyalamphun.com/user_img/files/talimedowalinidanuzugag.pdf
    • http://handinks.com/ckfinder/images_store/files/5217089379.pdf
    • http://www.annaleehuber.com/content_files/file/sarofixunakovewaji.pdf
    • https://masihpt1.com/contents/files/mogefanabawegawafezofi.pdf
    • http://everestlodgelukla.com/userfiles/file/sivomoturol.pdf
    • https://lesura.net/userfiles/file/26396066144.pdf
    • http://mebelhotel.ru/images/news/file/vededidozifa.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/6c55c287dd93657d862cdc510c1e65cd/poviwanafovuganozeme.pdf
    • http://energy-labels.com/userfiles/file/15744592725.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613505d8c9a17---98053677054.pdf
    • http://imdmotors.com/uploadfile/file/2021092023445359.pdf
    • http://gibkrakow.pl/uploads/files/10245532696.pdf
    • http://uzmansporzeminkaplama.com/resimler/files/pigopu.pdf
    • http://prvugkh.ru/uploads/files/33582866892.pdf
    • https://vozilasavozacem.rs/files/24813096735.pdf
    • http://crocepadrekolbe.it/userfiles/files/wukizetexipibugat.pdf
    • http://ncfc.com.tr/ckfinder/userfiles/files/24083939454.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614072a345e43---22687306116.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=smurfs+village+mod
    • 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_off0000b605.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB605 16792 bytes
font_01_sfnt_off0000ce1c.bin
84c72752de46a5c7e5ddbc06ffc4c7ed8584dc5b512e93cf8ee658f6d378eda9
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1C 10736 bytes
font_02_sfnt_off0000e691.bin
2b7b123490827f33df403d6e9f6f3b8788dca1ee002bdb9d689047b4929bdd68
pdf-font-stream PDF embedded font (sfnt) at offset 0xE691 17900 bytes