Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed8b1ff091cc6a7…

MALICIOUS

PDF

85.6 KB Created: 2021-07-08 05:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d95a72e1816e926a7ac649ff659e594c SHA-1: 831004e09e3885d7805aedf96598348ae00962cd SHA-256: 4ed8b1ff091cc6a7bb1d81a3ab82085e8d1783cfa7714bbfb7debc26fb2e956b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm structure is a common tactic for redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a913c89b621---sadujevevu.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/a36i6idrhu67gf9pkv5596omvv/45397307457.pdf
    • https://ooo-kenk.ru/userfiles/file/wajoguwawajavebo.pdf
    • http://grupopiscis.com/upload/files/sopejanosab.pdf
    • http://meskerjager.nl/media/files/jekidim.pdf
    • https://floridainvestment.cz/files/file/furudorujumezepelawifid.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d78ec3d8f---15009847815.pdf
    • http://tourister.kr/userfiles/file/27261647046.pdf
    • https://vandolderskb.com/images/usr/dutukades.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/783ad8ca2d749abb2b06789326d1d4cc/62756731361.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4041176fad---93170391411.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/b8f09f3cb6c80d36bc904c46e660f331/xuzopujikufufesizaxudu.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608436203d446---witonagomo.pdf
    • http://abwva.com/uploads/files/86238486482.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9f5d60b3eea5ea22bd207eba3ede2570/gifipenikaganozezojarawe.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609185b3eca78---vuxasugoxipepofugowakazi.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/ee563459f15b666a9f20ba0dd21db596/dezonujawipal.pdf
    • http://martom24.pl/martom/userfiles/file/kakixaxuw.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072622410801---lepoxozif.pdf
    • https://osakadentalcare.com/contents//files/65075507547.pdf
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f73277faea---9129740207.pdf
    • https://luminex.pl/upload/file/48516942307.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=prayers+after+communion
    • 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_off0000ed72.bin
ae977c04c5be9504d29fffe171ef53f2b8eca97072cf5a05b3c08ca505b0080f
pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 16800 bytes
font_01_sfnt_off000118e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118E0 16792 bytes
font_02_sfnt_off000130f7.bin
d5590abfc0c61f896b3bc171bc11e1716ebed7bff9120df231ed4fe0b4e170f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x130F7 10668 bytes