Malicious PDF — malware analysis report

Static analysis result for SHA-256 0372c9e84e07b8e3…

MALICIOUS

PDF

73.6 KB Created: 2021-09-01 08:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5dc7202cd2be9144b74139aa69556244 SHA-1: 69cc9bfefb61a21fe5141edfaa7eb714a153cdf1 SHA-256: 0372c9e84e07b8e343c66f8614e3702f982296b78ca3c6d8320fe10a2720c339
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf7ee98115---fiwebefugiwopewumosaw.pdf In PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/72f602e4b16fb18e16099dbdba714b88/28056727623.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/57ba28f9a0ebbccba6fed8194bfe95d2/fapufuji.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/85371190184.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607e57326e07b---38526063976.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/53923981967.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/jabofesurokuluxe.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-7-23/20210723062656443020.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/34132680736.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/57023836928.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/sivavasumi.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963466bd3a5---zonanalupojidoxarozeb.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24fd6c4f8b---vagugifefajopat.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/39496685921.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/13781661581.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/43552758465.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/1fde9ad1cf55fd7fd652fe20c1b7dad1/87382557790.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ae21d099c---37969803775.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/32638706328.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/dugen.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/josinadi.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/xawinixifitifinus.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd2438b81c---57610744624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ncert+science+class+6+chapter+1PDF link annotation
    • 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_off0000bf1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1F 10548 bytes
SHA-256: 340276a332af219147afc85beca47758625ce21675716981cc3b1146ee5482b9
font_01_sfnt_off0000d720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD720 16160 bytes
SHA-256: 7de879dad616c578216ba2938062454c96bf788237129a3d48a732352d48a69f
font_02_sfnt_off00010063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10063 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1