Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9769edbb66c0013…

MALICIOUS

PDF

82.1 KB Created: 2021-08-27 18:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4fd6cc4e5b2556a518307ea33b5b8dbd SHA-1: 36dfcc60198aeb3bff1a5c69667a73b5ebce215b SHA-256: e9769edbb66c00136548d07027d9277660bc2e09327f52cb66b531eaf81bc621
156 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af2734faac---romirutukokirebiges.pdf In PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/glr23l6bo03jfeh46qfqgp9eqj/lexazov.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/najipajifedunase.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/luneridewetepi.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/sibixapuz.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/62498908992.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-8-16/20210816215837381220.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161053edfeb0f4---5267233562.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210811100627.pdfIn PDF document text
    • https://network-italia.com/file/71131271858.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa70dad349---juvamuvinot.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609159ff96283---47820898944.pdfIn PDF document text
    • http://pjteam.hu/uploads/deropebulugasemojagumevow.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/xumadevomulirunire.pdfIn PDF document text
    • http://geose.ru/userfiles/file/9213452028.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/4311825732.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/82792899970.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/74315890534.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/5v041cn97ls2ii6foifq8l3ned/luzituxobamuxeriguma.pdfIn PDF document text
    • http://robedecreateur.com/img/files/wabubewumoxekifokexosoz.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/zetagokofil.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/82750315351.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0b48e0e0342c96cc6fd38fd1273261fd/felagax.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c535ca1f799---posoniviwekonuwesinejufu.pdfIn PDF document text
    • https://kham.vn/userfiles/file/2367825626.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/zugevupaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=what+sins+will+not+be+forgiven+by+godPDF 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_off0000dcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAE 11032 bytes
SHA-256: 8ca082f3b06df25fddb9f40728e87772a43e439b47446b1d89a7ab50ccc317d6
font_01_sfnt_off0000f62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3C 17168 bytes
SHA-256: 643d101ff9e32a4fa3ae20ca79313f9fa6318d4f4d4233f44b67e10efe0f0722