Malicious PDF — malware analysis report

Static analysis result for SHA-256 4818f884bf2b52c4…

MALICIOUS

PDF

89.0 KB Created: 2021-07-12 22:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: adfa50a7a6ea8ca614bf4a6899b06854 SHA-1: a6e8873cd129090c352ca63e59526a8ed4fa33e7 SHA-256: 4818f884bf2b52c46a7fe79f682b7d03b4a6992d00e5fd88e3a154b37932db40
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on compromised WordPress upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable due to encoding issues, but the presence of numerous links to potentially compromised sites is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160757cabe27af---34717714228.pdf
    • http://werder-ritter.de/UserFiles/File/93141413999.pdf
    • http://clingac.es/d/files/jatuv.pdf
    • https://oddluzanie.net/userfiles/file/13587503233.pdf
    • http://humanitool.ru/userfiles/file/15328619756.pdf
    • http://sentezetutmerkezi.com/upload/ckfinder/files/73985363596.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/f2292a856cd56f5956e5b9af9a98c985/14008192931.pdf
    • http://faw-asia.com/image/upload/files/diputosajefar.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b9eb1f720---89830049443.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/h1ne2gu40bsn5b7er71efglg8n/nufabewiwotesedigeb.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc21cf2d3c8---ruderawifezowuzatavevemu.pdf
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/menid.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e23f108f8e2---xavijozagudupalilujo.pdf
    • https://speakingparrot.com/upload/ckfinder/files/55547922265.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/97bfe35330eb91f33a8a815ce859f64c/rezawozirikafugikojuwo.pdf
    • http://melly-incendie.fr/img_db/wujutijon.pdf
    • http://446888.top/userfiles/file/46163660787.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22fe3e0688---vunavuzefafuraretevisot.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852c1d8d573---netigivixixuvaxiwegok.pdf
    • http://foto-klub.dk/userfiles/file/denojare.pdf
    • https://ikansambel.com/contents//files/xedeleforab.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/9e160d47778f8b5cbcb2d5bdb91524e2/1916626545.pdf
    • http://seattleteriyaki3.com/uploads/files/farafixusowebutupo.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/k31on921hqdc3btnj1vjbpc9i5/66118895638.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac59bc9821---13950141196.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+the+gcf+of+3+and+15
    • 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_off0000f7c7.bin
5b5f1b01e2cef95a7607a5474604fbb17d360a2140ea951b536f707c1fbf872c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C7 10960 bytes
font_01_sfnt_off00011118.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11118 16792 bytes
font_02_sfnt_off0001292a.bin
b8f9be60ae853b6cf63627b2c768a152bdb2e6f712f7d4c53e04a54d168e089d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1292A 17400 bytes