Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5b933acd6bf22f…

MALICIOUS

PDF

84.1 KB Created: 2021-09-16 04:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2782f53d558321e208bdb4c4d366b663 SHA-1: 91fccaac7fdf6b5d17287df31ca83ba4ca0bd119 SHA-256: af5b933acd6bf22fb4c241232c95c093808ee0f535dc05d2ab7457e82b20930d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains embedded JavaScript and numerous external links, some pointing to compromised CMS uploads and link farms, suggesting an attempt to redirect users to malicious or phishing sites. The presence of embedded JavaScript indicates an intent to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://angelcabrera.com/FCKfiles/file/55406137205.pdf In PDF document text
    • https://xistenze.nagydavid.com/files/files/fatibivuvebabimeten.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1a9744aa4---dimexijujatowo.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/30461722665.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/48309356099.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/zosamivivideninu.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd421131c5---84467075995.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/64198230847.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/nadekodipazefarimapofe.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/70553672162.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/kevinupiluxixelasavoj.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/18511098487.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/tiwem.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/81946953443.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/welatotibukunotikome.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/jijolu.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/95636028439.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/xavefepalib.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/rujax.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/dilonofemuvivukajit.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/32562918859.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134df987c750---61292267910.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/76745463434.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/66bd98elo5vivhi69tfuk7fie5/26375387503.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/59497407394.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/54548929798.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vujojufefutunivuwilepovof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=best+free+live+rugby+streaming+sitesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38C 10912 bytes
SHA-256: a150bba6d5b5e29077d8fbb99c47ffb207d8a2a509ef7c4d5ff4d49a1b3e4436
font_01_sfnt_off0000fcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDE 17476 bytes
SHA-256: 6a5710f259eef0ac509f4f17f7e68f19d25ecd215ced017e27db884972ad9e43
font_02_sfnt_off00012a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1