Malicious PDF — malware analysis report

Static analysis result for SHA-256 239557fbf66c98e5…

MALICIOUS

PDF

92.9 KB Created: 2021-07-15 12:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cfbb6a1cbdbd3c34437ec4a813476321 SHA-1: 66cb0026339b6776c12c935710176a311392eb7b SHA-256: 239557fbf66c98e5554bbd69957882074130ff7a0fddb707cfd6ffb1d4a36354
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the document functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://maasmartcity.com/userfiles/file/zufalokuzo.pdf In PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160dbe8ded6d3a---71431563916.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/91944483948.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/63486773021.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/29359310438.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608c73d8d3085---tinunuvo.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609478a6ae631---puvuwar.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/81dc462d41e1545c092c9a8ed0c31038/2042880746.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/57995634606.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/watipojokorofe.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/78895638315.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/1iagtjq3ff8lfi3df16e63ii2j/78589543193.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/zotuvigupipen.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a844526a965---zuxas.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/fokusig.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/93806529320.pdfIn PDF document text
    • https://rcot.org/userfiles/file/fulejumowugufajako.pdfIn PDF document text
    • http://kanstm.com/ckupload/files/95328759009.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/kipatufologipona.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/29313574208.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9c5a27090---miginuv.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/jcimardbugs4lhho489ibnkv88/donesikakefulujenixazux.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/belozuwagisoti.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/9539b9799da07512213025f95a87e342/55919431304.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/xodobifivud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=discord+bot+that+counts+membersPDF 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_off0001050f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050F 18348 bytes
SHA-256: 8933ca5d690cb7dcd57a8460873c7f33e19092e0bc08076cf5f76b524d28edef
font_01_sfnt_off00013552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D69 10828 bytes
SHA-256: deffa31fb8b75783a217887e50a4c8bf509abc023db0c45e804df2ff47fbcf19

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