Malicious PDF — malware analysis report

Static analysis result for SHA-256 d96ce0b72acce5bc…

MALICIOUS

PDF

94.1 KB Created: 2021-06-30 17:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a39ed23bbe181c7f94f836326f505612 SHA-1: 8b948a987d12f2ada470424520da7b334db6453c SHA-256: d96ce0b72acce5bc192974a1aabc431ee5d6282404619c318c5198d47a53d6a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to potentially compromised websites, likely intended to lure users into downloading further malicious content or submitting sensitive information. The document body is heavily obfuscated and appears to be metadata from the wkhtmltopdf tool, offering no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://ntct-dz.com/ckfinder/userfiles/files/basisuriso.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160949ff98e99b---57615089077.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e8011a3ae---xujisuridutofiv.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b05d53e0917---jafomajozizomome.pdf
    • http://firegallery.ru/img/upload/24323850021.pdf
    • http://xn--o79av69abka850ab6c.com/upload/file/202106270658193799.pdf
    • https://catwalkdogcome.com/editor_upload_image/file/vowusafibodimususelal.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/b0sc7jp8rbsdol10qtfsmh7il4/mevuvad.pdf
    • https://primer-spb.ru/files/files/mekimug.pdf
    • https://invest.pl/userfiles/file/tufimafetigojuninibewapaf.pdf
    • http://anhbanglaw.com/userfiles/file/60779769441.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/f39f480b3b7c11b30c1040f8d34559c0/bozosurup.pdf
    • https://raljob.com/userfiles/file/14706871200.pdf
    • http://ithalattagarantibelgesi.com/resimlerfiles/92304094618.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/ae4b8c80e0667e37ed65e751448e1292/81796315173.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/838a68810e7e931899e342dda76250cf/fujibevafodogufojiralabe.pdf
    • http://ecole.ru/text/images/file/2252555881.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c47902767---96417708124.pdf
    • http://lactopad.com/uploads/files/48789277809.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b71194e5ae1---80698305885.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/60hnrrmu27vqnvc3m2vo862b2n/muvajamulur.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160847493b36e4---xojipojikipewom.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963c85ec68a---1743262821.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/bjppnjhlj03hlucvj54i3i8sno/fuzufifevuxameremaf.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d3c79628a---39851001076.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=kodi+19+builds+with+live+tv
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6d9.bin
fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D9 16144 bytes
font_01_sfnt_off00010c54.bin
35aca48395cc8adb721ed4648a11040c4378b82ecd28d3058ed364c4e260ccc4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C54 17464 bytes
font_02_sfnt_off000139f3.bin
2ab706929eb5cc99f7592fdbee86754f32c010188e4f1e468196689e9bbb7fe1
pdf-font-stream PDF embedded font (sfnt) at offset 0x139F3 10580 bytes
font_03_sfnt_off00015258.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15258 16792 bytes