Malicious PDF — malware analysis report

Static analysis result for SHA-256 780ff863a0f570de…

MALICIOUS

PDF

75.8 KB Created: 2021-08-08 13:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 608934ce467f72972c8265ed4e451e56 SHA-1: 4c3c9144895573f6dec73f38a6bd627d10c191ae SHA-256: 780ff863a0f570de8010cfa83f7c4b4cb83e4a42a43bfaaf8ef748e2271ec4d4
196 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 WordPress installations and utilize SEO tactics to appear legitimate. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly indicates malicious intent. The embedded links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://medvor.ru/uplcv?utm_term=harper+biochemistry+mcqs+pdf PDF link annotation
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607232cd626e7---98160375290.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/41327710041.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/37588870681.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/34166466871.pdfIn PDF document text
    • http://imi.vc/upload/files/keleporavexebesa.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/d07331d5c8cf4ec3b2959b6cdbd111a1/pejir.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/71419585363.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/58054626682.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/wotixadep.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd4c53dee0---63836070118.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/lugujojimepejituberes.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75796146618.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/98368177836.pdfIn PDF document text
    • http://envigest.cz/upload/file/sojakoz.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/82016857018.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/bulibawiruduvawi.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774ace1fe89---luvixawagelet.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/18062409244.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/demofumuligakitu.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/ditux.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/vetexij.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b101a00132b---gobaler.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/80855892210.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/roxidu.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/3119096787.pdfIn PDF document text
    • https://kenadong.com/contents//files/84558610211.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19187cc7e6---nerovibugasidasogajadave.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_off0000c2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BD 16380 bytes
SHA-256: 9f074af0c013359d62c61d7249e029eb1bbea4acac4e500ebebffdcbee63a487
font_01_sfnt_off0000ed6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10586 11124 bytes
SHA-256: c4a2aadd97f9d4a62613c15141860b860f196560c5fdf83e4cd12343b0f055ab

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