Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf1dc4c9f3b39f8…

MALICIOUS

PDF

94.7 KB Created: 2021-07-01 20:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7a62f51a960e6d5a5156cc00a6bc9127 SHA-1: 386a59bce9b603f6b86d0651deca2a7b7729e193 SHA-256: 6bf1dc4c9f3b39f86ff4e8cd84c153e5eab58899e6386bf1e4463a28956496cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://irlanc.ru/uplcv?utm_term=game+design+as+narrative+architecture+by+henry+jenkins PDF link annotation
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ab7844367---27817478908.pdfIn PDF document text
    • http://nessium.net/userfiles/file/gewugoginiwafivulojewaw.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/konakogopobu.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/woveraladofiwopofo.pdfIn PDF document text
    • http://mfahk.com/upload/files/96169007029.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/cedeffea320423d367b7e0b6fa481042/57020079460.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/xidaveremewi.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/fuae6lhanker0ded15g4sjbio4/zewewo.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/kisipotu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/21ae788effbcaa62c171351aa1fc3249/13547641510.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/41296977131.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16071db07b770d---87926215468.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160817541e471d---73629355988.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/30676031632.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982d1ad1065---74723023007.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8351829897---muginotaxojovow.pdfIn PDF document text
    • http://promador.pl/userfiles/file/poforalovikuzapab.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/62055653095.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/1c533f8c2797ae0cb0bc7f7d07f90279/jejasexinepulusililazaxe.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/fafexeku.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/vutifatopiso.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210623_4D1F764CDD42BDF7.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f1clgks55tq06qkv6vhsae2241/sawawegegalixinenudise.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/xitesunam.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_off00010b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B47 17400 bytes
SHA-256: 5c8bb263a60ffdc839c79f480eeeb4bd978539027b458ad21382fb443e56b27d
font_01_sfnt_off00013897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13897 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150AE 11332 bytes
SHA-256: cbbe9da5d455b2a322204bb3ada1f7acf8fb7cf6e76ac5f0fcad777fec52be18

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