Malicious PDF — malware analysis report

Static analysis result for SHA-256 24756f0b69f1414c…

MALICIOUS

PDF

214.4 KB Created: 2021-07-26 05:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c6c05cca0ec1838837386f7a8fd15a09 SHA-1: 1845953d0d4ebb2c13f0052ff8d3ca7ecd689914 SHA-256: 24756f0b69f1414c1f763a5936d5896e15785f7731089522e47b867bf5b2e91a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF, as indicated by ML and ClamAV detections. It contains embedded JavaScript and multiple links pointing to compromised WordPress upload directories, suggesting it's part of a phishing campaign or malware distribution scheme. The primary attack pattern involves luring users with a seemingly legitimate document that redirects them to malicious content hosted on compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5595e1a9c0---kafof.pdf In PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/javajevorefebi.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/rerozululovorenudimeveke.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/a3ba039fc8d8ac22e88d950cc37c997a/35078406018.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/36027689892.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/3d05dcb7e2b78f955419c99f0bbf774c/6657534424.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/233cb48ee35b208b39e0c87490f0985a/54064939397.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbe79c98fc---bajori.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071e5b0a9d08---polabuzizesagigofagutebov.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/hpnlbuok53m8po5don7bl8cq01/riziroderefuxezuja.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/gadononosefuwulosopibe.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/r9m31nos081il97pugcinhtkvl/69950262848.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608d06c5d134f---8597890391.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/ledozinebip.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/zulurafuwuvekemajogaj.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4de3541084---wegowukigegemosekopebitor.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/c728fbc22df4aa65f219968972754ae0/nupelafolusulusewopexu.pdfIn PDF document text
    • http://northcity.rs/slike/files/dudiro.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/jogech1f4beir1p8mr78q4qu24/bixebudexizebivabe.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021062445851_478887758.pdfIn PDF document text
    • https://marosme.ro/hirek/file/lojunonupiripoxinom.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/87194233093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=quantitative+techniques+in+management+nd+vohra+pdf+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002dff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DFF3 11524 bytes
SHA-256: b2e72c16dc9755db129b042d9d1542404dba4d53f9e02e417e9c92121b712ceb
font_01_sfnt_off0002fab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FAB4 21720 bytes
SHA-256: 317b2a76b9a441345eedfaadd91b3f702f946f08f06055f24d8d588096aff38d
font_02_sfnt_off00033074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33074 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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