Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f6da02335153e9…

MALICIOUS

PDF

76.9 KB Created: 2021-09-07 16:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e6d49f0133b0943e64275f148bd0bd10 SHA-1: 069642501e588680f4d6ee86475e99a8f537cd6b SHA-256: f3f6da02335153e9c8239071ca51015eefc56a02f6124503be9c2612d179c554
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised or disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pantipplaza.com/userfiles/file/67805246143.pdf In PDF document text
    • http://szyuangang.com/UserFiles/file///larifekirozulifevopene.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d99daa693f---77267307861.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/fn6ho5a62m59nr8cpr5q8ffn34/vabavowabopifigavegi.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/fuzotigofejojid.pdfIn PDF document text
    • http://jiab.net/userData/board/file/lotajemamerota.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/81754662366.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/pukefigimudam.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/rufapegimugub.pdfIn PDF document text
    • http://haphadoor.com/upload/files/puvopunad.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/94803979409.pdfIn PDF document text
    • http://beiks.info/public/file/tegaron.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/vurelebode.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/99424622472.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/jipovegexezigim.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb6ca998b1---sagalekera.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610b6ce25b56c---zabuvabekofifamenazeza.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ln9hsrvcpvbmh9fusrolas93c2/40756075376.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/fc125746ab0ed666c3476ff302c105ba/509058163.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/88619242112.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210623_F5B3395D10F13EA9.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/38048294978.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/41054916780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=solving+multi+step+linear+equations+with+fractions+worksheetPDF 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_off0000c9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CD 11492 bytes
SHA-256: 36a49ee1e5678193ce9435dab0e10d927bbf58747dfe803a5e84318348eaed3b
font_02_sfnt_off0000fc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8D 16072 bytes
SHA-256: 6cce22e36cf95ad3d70218734d3a66305e02af17dbf08286b8807c4f34f3903c

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