Malicious PDF — malware analysis report

Static analysis result for SHA-256 8092bd648ad8a9cb…

MALICIOUS

PDF

73.5 KB Created: 2021-07-31 14:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 003cb79eea4fc024d054f0da0d7712c8 SHA-1: 94be29dbc7600e52b7453c8ba37901f32445593c SHA-256: 8092bd648ad8a9cbff047f376e3294b7a7ebeb89b105b9ebdeb565f99076310d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to execute malicious actions. The file also functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. These links likely serve to redirect the user to a phishing page or to download a secondary payload, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/99906097428.pdf
    • http://tomaszfilipczak.pl/userfiles/file/84833523136.pdf
    • https://inncredel.com/uploads/levulenowube.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa80773e5c2---sivijimubajilonij.pdf
    • http://autoshiftbid.com/fckeditor/userfiles/file/27917598015.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a2b80b84d---57554123919.pdf
    • http://graviroz.hu/ckfinder/userfiles/files/vudolojegemofevu.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ca8f43856afc5d0f42118303e73a2df1/54446435811.pdf
    • https://madspot.dk/ckfinder/userfiles/files/13904772385.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/69416078835.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d00980b763---tobumirasi.pdf
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/796740809.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/cr3m64g90vfgldk1niolcuhr8v/mikemusetufujajetaxij.pdf
    • http://due.pt/js/ckfinder/userfiles/files/dutubifamopiperebefudulo.pdf
    • https://walnutcreekguide.com/wysiwygfiles/file/85345912591.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021632338515516.pdf
    • http://greenbrier101.com/userimages/neninud.pdf
    • http://randalljroutson.com/clients/44711/File/wiperovuzudodokudajotovi.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9efb4c9746---59279327487.pdf
    • https://laetitiabernard.fr/images/file/ladobogigokagimofubelipas.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746e078ceef---nazixudadufuzunezaleni.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c084acd0dc---fafijukin.pdf
    • http://asianmosaicnyc.com/userfiles/file/ripoxibubifeminu.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe7273ad8fb---kifuzoki.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=harmony+improvisator+vst+free+download
    • 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_off0000bbcb.bin
a3e2f164c1d6e872d811bae1d97e6ab43c95182b496477fce15a815d254732c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCB 10916 bytes
font_01_sfnt_off0000d51a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD51A 16792 bytes
font_02_sfnt_off0000ed2c.bin
ef23e5b183aa08ad4aa40b866f97d0b983a1b198e37d068a2e944c874dd02f4a
pdf-font-stream PDF embedded font (sfnt) at offset 0xED2C 15952 bytes