Malicious PDF — malware analysis report

Static analysis result for SHA-256 35bf220435ecb6f8…

MALICIOUS

PDF

89.8 KB Created: 2021-08-01 01:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05907401e45aa84399c1186d1654d130 SHA-1: 9732a179f6c0679bd77738abc2848c6772537193 SHA-256: 35bf220435ecb6f86263417b3b6fef69f293a02831d4c376bfe331a2daf3c6c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed to redirect users to malicious or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://lienlacanien.com/img_pages/file/36908610086.pdf
    • https://cornerstonelaw.eu/userfiles//file/wifofozuvexamive.pdf
    • http://dringraldi.com/clients/7/73/73ccc230e5ee2b020474e4a43bcd07af/File/36483876889.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/elsfaj3egmhvkqoenijrubqnbb/kulamuxijasetemesafimidek.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/fuxesibuvofap.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/cq1sn1det93n1nieujnb3a6ecq/busanujewekexipobiwasegol.pdf
    • http://hk-keber.de/images/file/81670630212.pdf
    • https://herfection.tw/upload/ckfinder_temp/files/20210629125746.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/76d31e3e9da265fb4a3010ae99254b08/74172080919.pdf
    • http://bora.su/ckfinder/userfiles/files/tagofasunameros.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/941990204609ad301902b3.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/67673037595.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960f5165326---vujotu.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16087694917dcc---58579808633.pdf
    • https://cr2tek.com/userfiles/Proj_Name//files/loromimozagawu.pdf
    • https://lapalettedesarts.fr/gestion/file/nugexudoriruke.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9d25de52c1bb22fd43e380d77a309b6a/kopupozex.pdf
    • https://ceccarmehedinti.ro/userfiles/file/fifokutunetojasija.pdf
    • http://soflocops.org/clients/83264/File/43740954508.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/734bd248b5e199c300455e48446b7442/vuvaf.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a115c3eed9---mironazenivosubuzewot.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b82e1289f6b---jizoris.pdf
    • https://observatoire-omic.org/documents/file/80892512685.pdf
    • http://doggystylzgrooming.com/admin/photos/file/julifogititarakatafifu.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/nktqdpi1kpqprtnjghknatso17/31318678239.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+use+a+blood+pressure+monitor+cuff
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fafe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFE 16792 bytes
font_01_sfnt_off00011310.bin
316265f3790a0ec2e56dc299207c015ee11058c1199a4d303dd9a233c5cb6fa8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11310 17296 bytes
font_02_sfnt_off00014067.bin
23bcddb2948075d4c2b44c7e1634b7a3b3ef433f08eaf628e7bd43a4ae71b912
pdf-font-stream PDF embedded font (sfnt) at offset 0x14067 11100 bytes