Malicious PDF — malware analysis report

Static analysis result for SHA-256 5985e70847855075…

MALICIOUS

PDF

89.9 KB Created: 2021-09-11 23:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7e97a90dfa73f7533c4eb67d537693aa SHA-1: ae6874d2fce3274e88e52ccfb21f12cddd8ba892 SHA-256: 5985e708478550755d305e709d3ae61b01d14f529e21be7234d024f618c099e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=example+of+ethical+consideration+in+research+methodology PDF link annotation
    • http://sicompk.com/survey/userfiles/files/mokalewodub.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/37908882962.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/sixafikigelokezizabepeva.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161353afdaad47---wogigipopubigexibilejuwad.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/90187056267.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/91640013118.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/jazanusinafajedurinutux.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/madufusatufagofimeru.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/xibojeka.pdfIn PDF document text
    • https://begili.com/uploads/image/files/gozimiwu.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/22175575672.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613abdfa05de1---voxaf.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b275a15f0---69607693816.pdfIn PDF document text
    • https://kaimano.it/file/63317799189.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/28021948210.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/garejumet.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/wufoludixonukuzanig.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/54198509129.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132daf4b9623---posakeweribid.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/gitejosefapamotuxuma.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/wasakizojupumoreweniza.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/mekiwuxi.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57335082060.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/galiferiviretutisikalevuw.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_off0000f7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11010 18248 bytes
SHA-256: 0101ef56107d87a496a390adeacc2c0c3c35258358da3fe875469c45a5102db4
font_02_sfnt_off00013f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F53 11264 bytes
SHA-256: ae179f6791632b38bfdef5f2483743c9600632b520b17e0c8fc553328cc9d4fc

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