Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cba81ec53243894…

MALICIOUS

PDF

85.3 KB Created: 2021-06-30 12:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cdc21de91183c1aa2c4dd02364803368 SHA-1: 6e331bbaf43558554c964534ecfb833c0fae0895 SHA-256: 3cba81ec5324389434716891ae9c16d3667b465d905ff8fee2b1473099333ac7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://huntic.ru/uplcv?utm_term=uruguay+national+football+team+players
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95e927882---36776013975.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/bcff0cb5133516f11393d5b4b721dbec/rotofopowevikozepaxofa.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f896e7c5f---jinilitivizis.pdf
    • http://apsencollege.org/test/fckeditor/file/45091152558.pdf
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/jupukenurozupejutox.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1f286c23f---67225191926.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ugq1rj7cirnn39dmj2l3lc0utn/26019408251.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/ebrtuftl4kqb8jh5sf2qiosln2/sunatipukutararulufobala.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/c6ecf3c2806d5229468d108cfbbcdab3/83469527548.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a22f397b2d---9742939287.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/6v5gfai79u938lssjfdfs4i67f/silawuvofizavol.pdf
    • http://kulturazebrak.cz/userfiles/77095693999.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/b7n2dpa9bvjd59850o6b3lg70c/pojanazajugadavi.pdf
    • http://navigator-nsk.ru/userfiles/file/95540962751.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95ffcc1236---49559648712.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fe6be2867---6682339340.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0dc72ca87---bewuvomowezira.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d624bc93b6---gidexowomofezusupudodetun.pdf
    • http://merrygoldholidays.com/ckfinder/userfiles/files/89361193888.pdf
    • http://zonwering-nederland.com/ckfinder/userfiles/files/xefineximovovu.pdf
    • http://asustainable.com/global/file/tujakixume.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_off0000ea13.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA13 16792 bytes
font_01_sfnt_off00010225.bin
bdf93dc78eca56b934f21d6678664b228e0835faf64d0b76c284bd03a3782aa6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10225 17028 bytes
font_02_sfnt_off00012e8c.bin
fb959f1b2f315972f486ca5171763a295e1b9120a835d45350f636be50a93069
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8C 11060 bytes