Malicious PDF — malware analysis report

Static analysis result for SHA-256 673a49e2ea44f0bc…

MALICIOUS

PDF

79.1 KB Created: 2021-09-01 01:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b500a210d31caf56d2f46ac52b0f062 SHA-1: 45ba491c967713400d00f1c0cb3a3a354011dbd8 SHA-256: 673a49e2ea44f0bc5f86318c205e1bad0fff984b11d570b08a3bb4c905ab3456
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The document also includes numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://to-kajihan.net/js/upload/files/9424041049.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/ur9pqvogr6i59ck0m7fgdbkgq7/puzalifofos.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16092a2e8ecbcd---54454419538.pdf
    • https://kaparatt.com/images/File/kufasazukegob.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/eg7gp7u70bsse85m48aee4tqr5/kerufalowijaliros.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd83a22770---68879886657.pdf
    • http://navigator-33.ru/media/file/zubejolegitapidovugumo.pdf
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/84973917111.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ro5iukf9hn3bt2204aad4rv3an/98953014206.pdf
    • https://xo-sound.ru/userfiles/file/rujuwizivefosenonuzofu.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081954245890---fodudufug.pdf
    • http://travelport.pl/userfiles//file/68698661508.pdf
    • http://banphimchuot.com/userfiles/file/43906355853.pdf
    • https://ap-qatar.com/userfiles/files/zedugebimadexobalubidan.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd2470b41e---tunoxoludolezexalo.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0b4c60581---91381239700.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/6b35ccacd7f47ce734806821c2888051/biwudikajodexaxalabovopoj.pdf
    • https://fleschimmo.lu/userfiles/files/81760509352.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f9f9232160b---32548445964.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4fe4caa944---rorakobevaxi.pdf
    • http://sieuthimaynhapkhau.com/upload/files/41331363286.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/rv99gjsb41rpl0gb0e3jmd8d67/45139547239.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb8c4df227---sipivujuwosudetorag.pdf
    • http://kiavysocina.cz/UserFiles/File/20112882762.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=team+performance+review+examples
    • 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_off0000d175.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD175 16792 bytes
font_01_sfnt_off0000e987.bin
2520540e0f27df0c14c1eb7d6dbc307db57ce8f082c0c6e9e15d22cd5d8e4f52
pdf-font-stream PDF embedded font (sfnt) at offset 0xE987 17020 bytes
font_02_sfnt_off0001152b.bin
c6d4c0ebf5838ba2ec202a58001c239de7e901a2d43d508397ca5054e96de3df
pdf-font-stream PDF embedded font (sfnt) at offset 0x1152B 10760 bytes