Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17f2d5f4f10d6dd…

MALICIOUS

PDF

86.5 KB Created: 2021-09-06 15:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d403b1a5ff49c942dff93b1202b3f254 SHA-1: 24a833c4630f67756bc16d0a9f9de0ffde853eb0 SHA-256: c17f2d5f4f10d6dd0da9579c5845009a773df27003eb00df22cadef04444127f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and extensive URL list suggest a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pistant.ru/uplcv?utm_term=shadowhunters+pdf+book+1 PDF link annotation
    • http://gleneaglehoa.org/images/file/tawamajavutate.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab257094a24---renedoxaxesawejon.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/geruzagasifugulorazelesev.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/suwib.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1611e83268c23b---27142460455.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828f05678f3---45352687268.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/70053788008.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9a6f73e42---supudebexevodavet.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/14eb868602ba2e26cbb18b5b5f0a5f8d/9117258369.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/judedatabe.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/zasiwulumawigana.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/63574750148.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/40708311809.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/26958384690.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612b60100a631---virusoz.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a705cace840---40211456634.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/a05675c965dc4dfc4ba747d7582fcb5d/65993456439.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/sebixojegoni.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a231733fba9---jularerizazewarisefuve.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/81460856102.pdfIn PDF document text
    • http://skolky.info/foto/images/file/sotixulabowunojijoj.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/tenokeluzupepose.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/29677153512.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_off0000e8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E7 19088 bytes
SHA-256: a71aaad8f2e26b6f2a035332180ac04de7a49d0225706fcd949f0f5838da2a2f
font_02_sfnt_off0001333e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333E 11000 bytes
SHA-256: 0a2e7da657132d53d693e3c1fea6a209445b572d097eeeb057d76363ada8e750

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