Malicious PDF — malware analysis report

Static analysis result for SHA-256 083f0cfdf4aeefd2…

MALICIOUS

PDF

109.4 KB Created: 2021-09-06 15:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a42973c1d98ac851109a22a3aa0ecd7c SHA-1: 3639bbc6517fa95aa37b74c211b1b31c1e1581b9 SHA-256: 083f0cfdf4aeefd2434bf8fbd16da42eb15765b109a5b4c45a76f2a5a25f1764
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The file contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the PDF is part of a campaign to distribute malware or conduct phishing via link redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://archism.ru/uplcv?utm_term=cebu+map+with+tourist+spots+pdf PDF link annotation
    • https://alshamiltrading.com/alshamilfiles/file/babuvizesisumelijevare.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/walasozekekimulewoxaxir.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124808f53519---vewekebulomisodinol.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160be2b493c923---20261207224.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611044a25ce83---japisekufatuxad.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/20762892827.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/retokebeworenav.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/33e740e07287c8cf67e2bac26cdc7fb0/zawizawu.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/387184448.pdfIn PDF document text
    • http://midel.me/userfiles/file/69774555795.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9403c5ea86---28996688085.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63e30e7f4c---39642288227.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/bazalox.pdfIn PDF document text
    • http://gtshotel.it/images/file/masirejovi.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/41d264564f204ebfb97348ca062f36cd/92346534288.pdfIn PDF document text
    • http://starrwindow.com/clients/863399/File/gaxuxuvazoxijus.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/5ea27036075fdef95c18caa1cd3140b6/gokarukilinasad.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/17fc0f61f3879b0809aef23fdc343b04/penovesipisewavoj.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/53521320267.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/zoliberebi.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/15bbe172da92bd000d37341fd830119c/tazipazotunusojegifuw.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/g1srhaomqduqc18fv2fo48n684/tipeb.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/sobtc80p4sjativ7qmnd8j5p5u/finanozo.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa042c93e5---92193983598.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jaxokefuneguvumakume.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_off00013f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15733 10972 bytes
SHA-256: 6dec20ae288b9ee8d714c0f6483bbb84822512ae3384e11918517c64c339bcc8
font_02_sfnt_off00017086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17086 20856 bytes
SHA-256: 5ba5be6e565a2dcde171673ab0240d07b3cb34ea84f67a9b7eedd4d31a8419a8

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