Malicious PDF — malware analysis report

Static analysis result for SHA-256 af57bf2c7431c8f0…

MALICIOUS

PDF

71.3 KB Created: 2021-10-03 23:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 461d55df9b9eae29577bf160c1392601 SHA-1: 175aa3958cba2b777e0b4f05bb6d76301a486063 SHA-256: af57bf2c7431c8f027111ed68fffa3efec44bf46020898b2d03b5d5fd7e1df7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The PDF structure itself does not contain readable content, but the presence of external URI heuristics and the link farm detection strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://philabc.ru/uplcv?utm_term=up+excise+manual PDF link annotation
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30022594232.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/popazeluxizavudademi.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4b3418fa0---34245367064.pdfIn PDF document text
    • http://youil.org/userData/board/file/kilijutowuragofafuro.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/dusepogoxujejafadajupifut.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/kekezafen.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/xawir.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130e638edb06---48939408144.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466e9344f1f---nuwijisowikabija.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/66524240495.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/4447453460.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/febefinomi.pdfIn PDF document text
    • http://kolkataangikar.org/ckfinder/userfiles/files/1797422821.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/96733169379.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150817c98889---rinebofatiraz.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/31184945970.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/99637539471.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/taludar.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/rqt0j88oi6b8lkrcnigu81u6mi/bulojixor.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f397f0b588---69439425657.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/30134399859.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/gemawininabovemulavokefum.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/filid.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/palava.pdfIn PDF document text
    • http://floramarble.com/uploads/kufawodaw.pdfIn PDF document text
    • http://elma1.ru/!upload/files/85424659058.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_off0000b509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB509 10428 bytes
SHA-256: 83ce99d3cb249c79701c99de0d56e08983f9d459d166947c171d6afc45c8a55d
font_01_sfnt_off0000cca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA0 16380 bytes
SHA-256: 71d6f380c28baf74447627475b3ec864f5a8fbf154d1f38d81b21443d2c07ace
font_02_sfnt_off0000f60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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