Malicious PDF — malware analysis report

Static analysis result for SHA-256 671e6ec4688843c5…

MALICIOUS

PDF

86.4 KB Created: 2021-08-30 12:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d0ebac740980638a77c203852151f7fb SHA-1: c3354e54b5cac0b2870e6efa6b0001173b6e2233 SHA-256: 671e6ec4688843c5e188932ea473d8c02023e5bc0b7847168500a08ef41c47dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised WordPress installations or disposable domains. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://philabc.ru/uplcv?utm_term=peter+dinklage+the+croods PDF link annotation
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f204b9eff7---58848047865.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/lopizeti.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/10017277430.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b986b046e37---37824342012.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/91788063968.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6ad99d2fb---53818424512.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/powuretovekupofebe.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/wisaselejasonovosanotiru.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/4191897135.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/30583570536.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5a3734d2d---28997672028.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/eff5fe127717bbb0b41e80f258055474/nokidurezap.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/nusitedemelipovefan.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/depaf.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210803_B62663BEC3D1D302.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents//files/88189479952.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/1943035851.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/79173781935.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f19276032d---82579777654.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/rozawufodutudosabozizumip.pdfIn PDF document text
    • http://crm333.com/documentos/file/6638203729.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/jafuxevi.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16117dc556c53d---20802030436.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f01417f7d1---femigevozeginakafutag.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c5635406---41714233338.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/26968617321.pdfIn PDF document text
    • 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_off0000ec97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AE 10740 bytes
SHA-256: 0d95b6020107d1657062f7edb293fa8217ae83667e75b1a5960b571e9c62bca9
font_02_sfnt_off00011d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D14 17852 bytes
SHA-256: 917c37d4d2b02449830feaf767380762edbf31e46b74429e10129f9dcf3719bf