Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2e70da5b280482…

MALICIOUS

PDF

69.2 KB Created: 2021-09-11 12:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b2b578a6529a37ab63deb91af91815ba SHA-1: 616b9449684d10e61782de95cd7671359ae91ca4 SHA-256: ac2e70da5b280482427b1ab6611972db52adedd78e5e569631f285fcacfbbcd6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://cructi.ru/uplcv?utm_term=pokemon+ruby+destiny+reign+of+legends+rom PDF link annotation
    • http://jarosi.hu/files/file/zafakufedorusima.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/34514161415.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/wuvas.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/54556220553.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/45889626108.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/xanox.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/podilejuduzukajumun.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/8897963873.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/36911881310.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/kaxele.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/witafijexitezavonunegudir.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/6dfbf1fa0e5b09110afa29434bb1a438/32960752927.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/11868224459.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161397a60e4b66---sififolewapu.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/51208786374.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210911_EC4D37009B76FCAE.pdfIn PDF document text
    • https://kaimano.it/file/60614851058.pdfIn PDF document text
    • http://humanlitech.com/files/files/turis.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/613a83f54d286.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/5636808868.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/gri5374a7ac5ofhp88f84ntop2/3535708922.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/mezezoru.pdfIn PDF document text
    • http://tradotel-riviera.com/file/6202523774.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134de8b94b20---guwexetezaridukefewep.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/91672346973.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/bepur.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_off0000b11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92E 14704 bytes
SHA-256: f81eb5ded4e68348161440480612bcb82986be12fbda839bc48e7acaeaf18d6b
font_02_sfnt_off0000edfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFD 10980 bytes
SHA-256: 5072c629047298c8e5cd604a5bb62415130fb2881ec94d8770c4c031451d2ab1