Malicious PDF — malware analysis report

Static analysis result for SHA-256 357437daad1e090c…

MALICIOUS

PDF

92.6 KB Created: 2021-07-01 23:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97c3ac0f0730b67d5d8a94376dbb30be SHA-1: 486703be922b5bc5e7ae47b683acc6adbfb616c0 SHA-256: 357437daad1e090c1f447b260d2a799152d4a05767d1518485bb0c8a9e9a4012
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress upload storage and disposable hosting domains, suggesting a phishing or malware distribution campaign. The embedded URLs and link farm structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://nomylo.ru/uplcv?utm_term=portion+of+a+circumference
    • http://ingenermarket.ru/userfiles/17928268985.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d826f50d64---73258101895.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/1d89c5e933655e7d862fca9b2e3358ad/96051583684.pdf
    • https://bandotrading.it/uploads/file/damunomojawazuduzeripi.pdf
    • https://cplastik.cz/data/cms/file/wobajukakakefizise.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/8dbabb2c05357d6b9d0140d1067a9cbe/605481387.pdf
    • http://erdivigado.hu/userkepek/file/nojupoganim.pdf
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/narunidulokimetigibad.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/qn30rbqju44sr4qijdl6e9pmi4/pekerolaterez.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e98ce77ac---nesigizamukejedi.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090df9818bcb---14434839883.pdf
    • http://etabetasurvey.com/userfiles/files/bonubotamitefusekopewo.pdf
    • https://bnbtravels.com/ckfinder/userfiles/files/31674291864.pdf
    • http://jar-ted.pl/file/23863665361.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4315ac00b---52943183498.pdf
    • https://nestaerospace.com/uploads/file/vewinitoroduxaximiz.pdf
    • http://year-c.com/upload_fck/file/2021-6-4/20210604213630683753.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/fa11950f54c611a926812255518af9f1/kutiwidufa.pdf
    • http://jedwines.com/cmsCart//upload/file/89731893642.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/6e0e3bc6f38b06121ef1ed05a6fee921/66183345444.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ba9a0f7fd---nutabezoredoso.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b90138ae9---detujekevuxabovuguruxop.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED8D 16792 bytes
font_01_sfnt_off000105a4.bin
e550a7fea92942cde5a48a4fd834a26e8f5ee23b8da6cadf6dd992352a7242a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105A4 10384 bytes
font_02_sfnt_off00011d20.bin
450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D20 16088 bytes
font_03_sfnt_off00013251.bin
6f98064231741bb807c1e61182b705ab59633d5f4e7d3bebf22649f51af80fbc
pdf-font-stream PDF embedded font (sfnt) at offset 0x13251 18872 bytes