Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8997f3773258a56…

MALICIOUS

PDF

67.9 KB Created: 2021-09-24 18:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 45ed73b125c9e4dd107934c31d331edb SHA-1: 27b06fb18ea85f5acc26d0e288ae06ce4f632ea9 SHA-256: d8997f3773258a564a6308fd8e49e2c847ca46b585b5ba372293a965cff13770
176 Risk Score

Malware Insights

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

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains an image-only interface and multiple links pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The presence of numerous links to potentially compromised CMS upload directories indicates a common tactic for hosting and distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 0 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 http://tcihk.com/userfiles/36311767235.pdf In PDF document text
    • http://walosports.cl/userfiles/file/zofibosivoxokop.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/92815863418.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/10285328331.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///dabijowosekifenibe.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/semixefijisesa.pdfIn PDF document text
    • https://lux-ride.com/home/u4-6pzgszajsb5u/www/lux-ride.com/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/42239192203.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/74782728879.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/jexatobedoxejikuj.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lejovoxoperiluvedabixuga.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/zazifed.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130067fe73e3---14448884.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/73226015072.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/gulat.pdfIn PDF document text
    • https://webmenuplus.com/images/file/luxikaxokot.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210905214909.pdfIn PDF document text
    • http://henca.com/files/details/file/xitokeba.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83523109639.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/sugesikijovavifumikumi.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145803d81a04---tesujopogagovigu.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/74235667334.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f93f19a3e---55732638123.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/pojaj.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1f757e384---43843801511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=wr3d+2k17+mod+downloadPDF 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_off0000b03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03E 10484 bytes
SHA-256: ffd232499483d1a9da5c296968d5c047e3864bc045a9a9b76da9bab00ccdfe2a
font_01_sfnt_off0000c83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04C 13816 bytes
SHA-256: 6e4cd7c28b35034847cfb973cdff6865a4633a85900252b9c29c359ff5c3b7cc