Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9738e0427a18d0…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 12:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a984ccee2532fd6edf41881fed7ea638 SHA-1: db757ac830bad9cdc7460862ea6fb12c6331bc29 SHA-256: de9738e0427a18d09213dac6638f436ba675822f23dd1d83393ec5b88fb1e1ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that may leverage embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=10000+to+15000+tk+mobile+in+bd
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/pivat.pdf
    • http://geredekombiservisi.com/userfiles/file/76325682185.pdf
    • http://rotarybrescello.it/userfiles/files/mewutasemagu.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d820ac99f9---setekuxufifomujeseke.pdf
    • http://kmconlinecme.com/userfiles/file/60086940862.pdf
    • http://hwayinn.com/image/files/20210911_115036.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/295b3bf2244dcd0e05ffbaf446b9d01d/jiligij.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613035c38cd3a---65159754554.pdf
    • http://tianlanip.com/filespath/files/20210913051420.pdf
    • https://bulgariapools.com/contents/files/97128370058.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/3ab82567234e90efa5c1969a53c3563e/bisenajazemaromifi.pdf
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/givigeb.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161322d85b9973---24582686258.pdf
    • https://migger.dk/userimages/file/80426143116.pdf
    • http://cc-loges.com/uploads/file/rarubajepuvosomuz.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b36624818---junogiwemilarasubotixo.pdf
    • http://1544-7419.net/upload/fckeditor/file/63641707906.pdf
    • https://zenmobile.in/jaipriyart/uploads/files/bazuninukav.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/30c7f771187b315f620f738d8fb69833/razekojijusuj.pdf
    • http://metalltechnik-kutschi.at/21501018778.pdf
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/pogamabixigexuz.pdf
    • http://transportdiverse.com/uploads/files/kevusevadi.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/8ec7104e75c57eeddd8d66651e40d0ba/mujireso.pdf
    • 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://ns.adobe.com/xap/1.0/rights/
    • 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_off0000d45c.bin
41cf30412c604566e3db8239455b09e80b3ebf38c6d83a88e97cea5072707aa1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD45C 18272 bytes
font_01_sfnt_off0001039a.bin
4b6aa07d18f3263d40d1939cd963a8c1fe919da15cf402b1fa1ced9a2fc3865b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1039A 10420 bytes
font_02_sfnt_off00011b2b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2B 16792 bytes