Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e17c3ba33be68c0…

MALICIOUS

PDF

87.7 KB Created: 2021-07-01 12:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f62e39a7e41033765b46fb94e6508a6b SHA-1: 05c5f9a1f78f89a1d2c9e9f4b97f2bb12b67c6f6 SHA-256: 6e17c3ba33be68c0c70145f3ee28e64e3e685ab40ad231063c4d7fd31d06d117
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress installations and disposable hosting. Heuristics indicate this is a link farm designed to direct users to potentially malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The ML classifier also flagged it with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/gqjhu70ivn0245546uhu3f0h39/dukef.pdf
    • http://workcoop.org/fckeditor/userimages/file/20210611104604.pdf
    • http://vzwsportenmuziek.com/content_docs/99634066643.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/72c912cb99501f67d24e3c44e392cd69/tafoferofajeliku.pdf
    • https://radio-aurea.eu/files/file/94387283716.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/8b2a721409659aea5d1a65b5b2abb361/bizur.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072543acbc36---23657606758.pdf
    • http://nsdadventist.org/FCKData/file/66356262305.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/5b88c3c8fcb2d2019d367cb5cf7a8c5b/dapovuta.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/c01bb405bb46e35163a13531a1ec3fb4/64191059561.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da2bb317e0a---59017623488.pdf
    • https://tenfci.org/userfiles/file/misivimalezibelabunidexaf.pdf
    • https://marjoyunlar.com/calisma2/files/uploads/93441078765.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b009f2b3e8---jibibaworof.pdf
    • http://fratellilongoni.com/userfiles/files/32399194886.pdf
    • https://oncetrabzon.com/resimler/files/31854444677.pdf
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/43070606578.pdf
    • http://aarogyamedico.com/userfiles/file/38715789813.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/096615889938dc9fc26ea2b4cf40b2e5/wetelokilowuf.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c509d2aa5fb---45208149159.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/35f2d767e9d9149f7bc9f2febe1673b5/11081287254.pdf
    • http://bonfiremadigan.com/uploads/fckeditor/file/85987295290.pdf
    • http://boissee.fr/userfiles/file/tiramuzogukobidinajaxel.pdf
    • http://hodori247.com/uploads/files/desupoxafokogobiva.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b591988a423---xemugi.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/87029593303.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2b3cd7cb9c4b9530d330b5ca56af46f7/69413660183.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077ae921e7a2---fevenakurekewimab.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=psc+degree+level+previous+question+papers+and+answers
    • 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_off0000f0a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A5 16792 bytes
font_01_sfnt_off000108b7.bin
8aaf4081ac8d03ba69b632b08c7b6030076d1e3feb03998c3f7e76d4f17c6c6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x108B7 17644 bytes
font_02_sfnt_off00013733.bin
5d9211d8403b9a0b162f76264122721c77a8547c18d4bf4ee592fdf18cc868d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x13733 11088 bytes