Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c94d6d13859cbe…

MALICIOUS

PDF

67.4 KB Created: 2021-09-05 11:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7ef93cdd2234b7c9ee472a125950d2c5 SHA-1: 16cfb4c0ea82edcb8be18675191ef854c2048bd4 SHA-256: c9c94d6d13859cbe53648c515fa1796c4454e8cd1bf35de879f6e1289a7a9f34
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF exhibits characteristics of a phishing lure, including an image-only appearance and embedded links pointing to compromised CMS uploads. Heuristics indicate it's a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. ClamAV detection and ML classification confirm its malicious nature, likely serving as a spearphishing attachment to deliver further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f42bb537009---20581516937.pdf In PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/26917159833.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ctmbim0gdov39i7bpkgjmrpve7/18908196583.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/welovupebizegepot.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/badupapiden.pdfIn PDF document text
    • https://icfas.net/icfas_new/dev/ckfinder/userfiles/files/vutesaji.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/45871441511.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/2cb2e2fafc0c7958b5c1625538b47d52/99984883824.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/9d0d75d4f834f5cf5490a6d6faf7de47/xakidub.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/bf8f202c820ac6e39e5be7cebae42aa2/kofubajozirig.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54cad0b0e3---15525426966.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33a8cbdac7---vikakuperuratovutu.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/tapoli.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/706560faaaf8700171cd944dc7871a88/rubemogijof.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021082714584580554.pdfIn PDF document text
    • http://nensi.si/upload/file/kexij.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/29058557195.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/4bd882ca952c3ba694ffee9d9ff090b3/ruzatiwo.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/34252469736.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609675aeefb41---zezinopi.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/46176848254.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/seveloje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=prelim+1+dressage+test+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_off0000ae03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE03 14004 bytes
SHA-256: 7cabf904a9e969ce1d8b65c395bbd0217e367d189226adb490dfcd51f6d84dd8
font_01_sfnt_off0000d03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE853 10672 bytes
SHA-256: 6c2328ef09ee44e0efd9af2f9279a3311c6740ae1e95e28ab14bb125f6904ed7

Open this report in the interactive analyzer, or submit your own file for analysis.