Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f8d1b52e4cc3f9…

MALICIOUS

PDF

79.2 KB Created: 2021-09-01 13:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 52e48929218d5750929c4da8d341a5c9 SHA-1: 755a029389a07dfd0dcc28d4f6e4af882521cd03 SHA-256: c3f8d1b52e4cc3f9dda1b36948465e9c77c479ee1ad2c68ea24cb97b030d0c7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous links pointing to compromised websites, including WordPress upload storage, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pistant.ru/uplcv?utm_term=dog+and+girls+naked+video PDF link annotation
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160d91c8426e0d---34929325087.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c63e92e4a77---30352939912.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/17ktvtalntki1rrgaghn7uo2d1/luwokuwigavabod.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/524c9c56239dd000473a6641db474992/62982136351.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd1453cc29---33754910321.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/51668466561.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/83352436195.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bc15ea60f1---8555462366.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b8c1a04ff---31994844129.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vomezogosusivukesolarorav.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/39dbb0a2fe0a6d06b1f80c5bcc27f133/sebelulejasufamafezuwaj.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/diwexuvaxir.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/88820028721.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/feloxogisujojazogakuliso.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/rajsdtis6vnqbc3ghi1obli60u/jagupenibabiviloji.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5d099bad4d17dcb7d198c20df49633cf/veloravefikufi.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/13259576155.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/zirukowedikozenozurajogo.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610e5e88236e4---dejezu.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/34053069695.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/wefujopa.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/42874514505.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/45847664176.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_off0000d0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BC 10484 bytes
SHA-256: 0df7c49fbb006250ea9000f517064aaf807596e386331ffbeb2bd605a02521f1
font_02_sfnt_off00010071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10071 17536 bytes
SHA-256: ffd89ec4f728b9a5ccb953a45f2d2263bad3eebabea23a026272f22b469204d4

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