Malicious PDF — malware analysis report

Static analysis result for SHA-256 0476028b6b26f9cd…

MALICIOUS

PDF

98.8 KB Created: 2021-09-02 07:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4c5b51bbb39c5cd8996361ba31a4b7a8 SHA-1: 2a1022c9373a98f72272551f6e4e5101fbcb9416 SHA-256: 0476028b6b26f9cd825c6a57b61b7289373fc5cec983e7d011e8aa87cc7e8891
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern observed is the use of a link farm to obscure the ultimate destination of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://erdivigado.hu/userkepek/file/sezafetusitatap.pdf In PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae72118bd8b---laparowuvikebinumosaler.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c93558b620c---63330101148.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/biwavuzub.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084d20048448---16897565296.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/40795340fa70e375bc40b2893eeb6244/juvowapuxa.pdfIn PDF document text
    • https://i3mit.com/shopadmin/upload/files/rorimabebotetupewu.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/newuxusumapazaku.pdfIn PDF document text
    • http://ministerium.pt/files/punifulu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/pepumixerifogix.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/bikinigogu.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/f5190kg1phha3s8i4mgqtbl3r3/retutofafuz.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/vadusif.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/75061247108.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/0456068438e9bf15e484ac139875332e/4969339509.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/rabadojikopomodege.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/77586262477.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/71781360860.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/qdu7adbme019pjr6dt9875bj16/89631706669.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/6f886d50351f8d41e32e066a5d05c434/87515208751.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/96615373692.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16117d2e8a9ab5---tavukunusopevenipetigibot.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/zevaxuvugise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=yell+for+youPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05D 9780 bytes
SHA-256: a1074bbc63aa4d59c227b453d3124525295508668dfc5006b0672f7ca2a6ff43
font_01_sfnt_off000105ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105ED 24804 bytes
SHA-256: 34d4441ba68766d55aec22608ffa654516ba184d2166017adb764cf30ea2dba4
font_02_sfnt_off000144a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A4 1888 bytes
SHA-256: 228445a3744f13af4bf84041e55802a923554d86926eb0745489ea117e4ab105
font_03_sfnt_off00014d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D68 16080 bytes
SHA-256: 6ec0a307146d9be2bdd9dd9a35227856c774c3cce985d3f038f6c9b4f02e256a
font_04_sfnt_off0001629b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1629B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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