Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e3174ebb44a6eb3…

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 22:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 04eef0aeecbf8df1e7f9299309ae8ecd SHA-1: fe4dfbb06e2740244f871a30c97324aaa3ace085 SHA-256: 6e3174ebb44a6eb3a096692bc7e60903d6fd02588b4d712501eefc63a6ea0fe1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to potentially compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to distribute malware or facilitate phishing. The presence of these links and the overall structure strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fce0a77318---koxofugewizevosisip.pdf In PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cf73d8aa057---58959577750.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/87576536120.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/65135980038.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/tugulejutotonuge.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/rqk1rqu9kjqghg036cjv0i51e6/55301379108.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/nejuwame.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/32749062958.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a75e3e4e69f---lowosaki.pdfIn PDF document text
    • http://popmetre.com/news/files/67174860548.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/16215291659.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/45426539250.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/683ce8f925699a1b8053de62c47d6d2d/femunaluratovud.pdfIn PDF document text
    • http://614move.com/clients/4890/File/luradefewiwubutowaduvo.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/7a31ps14mad46ufba5maeds0eg/demedizuwegejabonodesemi.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/dawuginil.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/zebapadar.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/27257207692.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/19079182355.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160784bd5767da---nezamakudomodo.pdfIn PDF document text
    • http://haai.org/upload/file/bakusemabozikifarojike.pdfIn PDF document text
    • https://agrando.cz/files/file/wurixemeritovigebosa.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dba73aa5017---xenozo.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/diguwedativenatasaxete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=o+que+%C3%A9+metabolismo+alicia+kowaltowski+pdfPDF 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_off0000d7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBA 11320 bytes
SHA-256: cbccc2b3d4a18c962b746a857dff536a21924bec7f84c9236a28a04cad97c955
font_02_sfnt_off000109c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C1 18796 bytes
SHA-256: fae84e42e731fd92c263a0dbd4b22be58e84d0f42aead27fb7b4dd93b68457b7

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