Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce73bbd2a920d2b…

MALICIOUS

PDF

87.7 KB Created: 2021-07-24 09:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 31d68022d4c02398163989c9e55c3530 SHA-1: 6ac92c32b0acc7cba0dc84046203d833c3dd05cb SHA-256: cce73bbd2a920d2ba25c39be071b6404005ddae02191ed57970c59e13d84fa19
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, including those on disposable hosting, suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://isgsrl.it/images/file/bajewuzazajobege.pdf In PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/94601064619.pdfIn PDF document text
    • https://motiv8workout.com/up/files/xonolabena.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7824b7132d---18222154212.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/wovutogudoxu.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/93125544878.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/15735891020.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d15a3898e0---guzebenuxus.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/mivedovodowidobafusuv.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/01bio87ij2h663p83canftj3j7/39070028919.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093facda2cc2---kokilowi.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/vapizaganaz.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/nebizamabosifomugisatez.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/gapurilakuzefivoxodamu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/1079191162.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/puwiwibezutaf.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/80fa180bc026685426765ba96539fb6c/pazax.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/3e3c2b62e9f4384c927f2a02752d14c2/nawidavelumarisidajovavek.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/jorexazosar.pdfIn PDF document text
    • https://mattress-leader.com/media/99275179444.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/19880623928.pdfIn PDF document text
    • http://dzbnf.com/upload/file///6044299159.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/364ace55f7fd537614f19a387b0c3592/88908516403.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021052801514970554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=viewpoints+acting+techniquePDF 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_off0000f124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 10808 bytes
SHA-256: 0313354410f5e1b95bfe1ae371fff54d0e16aa3f255d7583a58422ca44804da8
font_01_sfnt_off000109ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CE 17392 bytes
SHA-256: 0942eb5ad65fb47fce6539588b7fdb53419694fb215a3d16d58a1ab6e6f4b039
font_02_sfnt_off0001376a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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