Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5d3be4d9bf9cc1…

MALICIOUS

PDF

70.5 KB Created: 2021-09-21 14:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1c967e0fd066a01f9e000501b54a9389 SHA-1: 1507753771ffac8e21d8c9014a35aa16ee2cbc15 SHA-256: ae5d3be4d9bf9cc1c89becd37aab5560c7aee3d0ea48f4d54882886203b71a5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://ketchas.ru/uplcv?utm_term=how+to+unlock+my+iphone+x PDF link annotation
    • https://birotex.rs/images/files/87481357990.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/40291327555.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/62820096647.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/38881324282.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/16227529572.pdfIn PDF document text
    • http://vhktn.at/images/content/files/tefedekafipenematowofoda.pdfIn PDF document text
    • https://premium-house.uz/images/file/zeravoponefi.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ntmugqr7ghj0s22jbgp5ep6gnf/bamutatofolikazijabeme.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614242bd504a5---97518197537.pdfIn PDF document text
    • http://rinsacars.com/files/others/fesajefekuka.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210914054657352767943.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/62007659864.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/34742584910.pdfIn PDF document text
    • http://soc-in.com/data/media/files/bupedimilisege.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/2372551973.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/23451555608.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1cb0147e1---kimilimitag.pdfIn PDF document text
    • http://dfanchem.com/upload/files/65391403764.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/jumemusiwuwafekituvifunux.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161414694f278c---98175182240.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/16229332356.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/63790058567.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/52670871300.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/migusujakox.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/putemesugibelig.pdfIn PDF document text
    • http://princeverma.in/uploads/files/negijutez.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_off0000b54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54E 10696 bytes
SHA-256: 46dd6d4a92603615617533b783fdbbdc57adb2a1a4e64fc2487d6745265a862f
font_01_sfnt_off0000cdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAB 15428 bytes
SHA-256: c7a9d071bdb59248fb4b8ee512d1cadf731054804484b9cef78890ec192d8728
font_02_sfnt_off0000f48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1