Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c082a94d308f69…

MALICIOUS

PDF

92.8 KB Created: 2021-08-11 00:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2fdfc6615148b0e887ba29ae5ed0a355 SHA-1: 3b367d57fd057a5da2ec352d2619b0803dd5030c SHA-256: 82c082a94d308f69947580d6a3b7c4dfbd268b35414341dc8c8c889f455a2810
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://iamsong.vn/uploads/files/5786593983.pdf
    • https://bevelec.com/bevelec/dossierMois/file/tofixizikuvatavifipo.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/afd1851b1092c76f5956c315b95b39d4/razufovitaxotexopatulo.pdf
    • https://epiphanych.com/images/file/14655917199.pdf
    • http://gillsandgeckos.com/userfiles/file/jemutafufibur.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fffd46d5eb7---wumix.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160716025d4a6e---dixokajefu.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/13d04961e0ca24b762bb45088ac29524/goziveximaruxirasuwu.pdf
    • http://learningkey.org/userfiles/tisulelizajifutozo.pdf
    • http://vertracapital.com/uploads/files/puneb.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/6a67587578feeb3b074055949a1a83e8/bumuxa.pdf
    • https://bandai-k.com/userfiles/file/sujivezirekuz.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609464a4e2cfd---sugozo.pdf
    • http://sity-luxe.ru/userfiles/file/12155894720.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5be316a12---3411655743.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160949f2e1bd6d---3620569967.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607baff0112f6---ximubelijovigu.pdf
    • http://drkoopman.nl/cmsimages/file/mozimokakanomiwimutuv.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bfb5590eb---mebakikesabebevijelagivob.pdf
    • http://atut-biuro.com/uploaded/file/jisuwi.pdf
    • https://vvpta-irvine.org/userfiles/file/28209618592.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d85be528ea---34098383364.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/bcda8aaaed0a41c150b55151e27679d3/fejezisamivuzonapasawabas.pdf
    • http://www.firengo.com/userfiles/files/kefatewunulimasazoni.pdf
    • http://artechq8.com/beta/uploads/files/28751172932.pdf
    • https://medicentrumnz.eu/medicentrum/files/file/nodowazabosajolurigokilud.pdf
    • http://wtmongolia.com/materials/file/gininodulememes.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=como+usar+un+transistor+mosfet+como+interruptor
    • 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_off00010208.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10208 16792 bytes
font_01_sfnt_off00011a1f.bin
eee0a92a04a13e51b0d1a324362b3c4a9b33089b0e8fe7fd19101e071b0eba5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1F 10728 bytes
font_02_sfnt_off000132cc.bin
032ab89cc6eb00a42a31915934bfa685b7772dafce90bdd9aa082ee2c002e310
pdf-font-stream PDF embedded font (sfnt) at offset 0x132CC 18692 bytes