Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c82d38e6bfbe71…

MALICIOUS

PDF

78.8 KB Created: 2021-07-30 04:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e4a07b02d43c98495343d7d2006ece3 SHA-1: 6ecfc0139a0f976a4c07f4a59589f0971f5012f6 SHA-256: c5c82d38e6bfbe714caf864885ced6104e59cf456a51650fcdd513825186c279
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be directing users to malicious content or further stages of an attack through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d654eb6d4ab---85750706871.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b02ee3ae77---dakob.pdf
    • http://bi-acaovo.com/upload/files/14475408752.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608520f15595b---dolowisixevadajuje.pdf
    • https://acronimocostanzo.com/userfiles/file/wepirorekitamaxom.pdf
    • http://www.prieteniitehnicii.ro/documente/file/mojejoforo.pdf
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/86987468048.pdf
    • http://bagiez.com/userfiles/file/82712945868.pdf
    • http://studiolegaletrotta.eu/userfiles/files/73063131735.pdf
    • http://donauwell.at/userfiles/file/74649326589.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/a8b7d0765ace637ff9c30c321a938bf2/guzagefofasosexowamifoge.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1541e15db---66908673727.pdf
    • http://khyljg.com/uploadfiles/files/76737551727.pdf
    • https://prosperitas.be/data/assets/file/nejanerotege.pdf
    • http://sartor.ru/upload/files/82964867959.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608309bfd7826---67883127187.pdf
    • http://asesorgubernamental.com/images/file/xadegimobepuv.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b27a669c925---57254187432.pdf
    • http://ilsogno-bomboniere.com/userfiles/files/77049391357.pdf
    • https://webmenuplus.com/images/file/jowuwinuxovewopigubu.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e657c3a00e---77223771341.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=robert+half+salary+guide+2020+canada+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_off0000ce7f.bin
cfd2286a6c9d50e5ba1c60704e073af05454092f2863a05249fc4290e77b52b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7F 16928 bytes
font_01_sfnt_off0000fada.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFADA 16792 bytes
font_02_sfnt_off000112f1.bin
242d1c613b690b1144cbc8971a11f8bcd8aab8e13ab880aa479cf20ed1e7484c
pdf-font-stream PDF embedded font (sfnt) at offset 0x112F1 11540 bytes