Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dd86fa729b0be91…

MALICIOUS

PDF

79.3 KB Created: 2021-09-09 09:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b0880fddcd0554af4657b0a0db83bd1a SHA-1: 791d51e52a2e7dc837c6fa70872c462117eceec3 SHA-256: 1dd86fa729b0be912d4e7b80e0b2112f874951796dcf159322b1d6f35c3e9d85
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cathyknightwaite.com/ckfinder/userfiles/files/3914542958.pdf In PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/44662002342.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/99340577952.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1630799564.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/puloza.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/48905186940.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/65374953055.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210902113237.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/44537300105.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/29ef166130ef399308a579d27f4ff87c/56360805510.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/21372345949.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/tewemefowoduzuza.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/zuzogobafixefudawidagafi.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/mejigilukugol.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/bagipamofuxumubuvowa.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/89910052720.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f69969d24---bejepepelakane.pdfIn PDF document text
    • https://diphong.com/uploads/91089936904.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/55068287749.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/87238648028.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/fegidipakafusugimesexepu.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161321c95dd0bf---xuxosogafonirelonuseperiw.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/momule.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/kerukover.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/gixudoketisulurakopulim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pdf+to+jpg+apkPDF 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_off0000d5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ede4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE4 16668 bytes
SHA-256: 18f14941de099e4714b8a03d14f14fd8fef1f1e885cccd173167220192a5be61
font_02_sfnt_off00011925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11925 10256 bytes
SHA-256: 32ab7c5421aa8c15638dfdc116c727bf4331aabe62e888fa7f0cafa6bf05c393