Malicious PDF — malware analysis report

Static analysis result for SHA-256 f64cf85aad02bb68…

MALICIOUS

PDF

77.7 KB Created: 2021-09-03 00:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8755fb1bdd02928ca75163d142854c98 SHA-1: 927f317b5c36310db4f96a31f85a9cf5afa7a795 SHA-256: f64cf85aad02bb689622c2ef3e69ce644696c66a25df21628229f64716710053
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

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 http://teamwork-poetschke.com/ckfinder/userfiles/files/95625465343.pdf In PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/31799678945.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/a2dc24da517ce442294cdcafe4403323/sazolewegogevafiledivev.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/45484634323.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/wololabozekanorusumovura.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/33589282601.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/31e28885a5d18640a2a3d9a344b50bef/mifopumuwuru.pdfIn PDF document text
    • http://novichiha.ru/pic/file/janegogixoporoziwax.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/16190673333.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/takejizetowebupegajojal.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/60626756120.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/gomonumelazalejodav.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/94771272363.pdfIn PDF document text
    • https://geo-decouverte.kenamedia.ch/ck/ckfinder/userfiles/files/jotiludeloj.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/fewujul.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/36480705025.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/58027686893.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/34008900234.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/e07cdba1ab6ac784bce7966183d87336/26498478138.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e424b7355---42849308141.pdfIn PDF document text
    • https://medtek.vn/storage/file/51807325726.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/reteludemitad.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081c2336bc33---savevinupodopoko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=igcse+core+mathematics+pdfPDF 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_off0000c939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE150 10868 bytes
SHA-256: e14c1406add5751d44196a0822e76b58a73facbc73381fb160577679c7484518
font_02_sfnt_off0000fa3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3A 17996 bytes
SHA-256: a87241311918305fe19da59491e63618021cfd3c0bcc9c3ad8d3d05e0075adce