Malicious PDF — malware analysis report

Static analysis result for SHA-256 79bb040e67901664…

MALICIOUS

PDF

85.6 KB Created: 2021-09-02 23:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: deed5be77d85ed1cd828e40e58c27fbb SHA-1: 1467d12cc95396feed32e33aafcdcdcf2b2e39be SHA-256: 79bb040e67901664017e9ee7d453e09cfcb40c3ac08b824ba034d10f79a36e35
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://drafthe.ru/uplcv?utm_term=visonic+powermax+user+manual PDF link annotation
    • https://adikkeempat.com/contents//files/bodumalolunuputojuruxasef.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/sidakapaxikotikiluxoxa.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/galotapopizafatab.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/tafetenufojokusan.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/jawozularatumemuvopis.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/lenarezujodex.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/161142fe082d31---35804972605.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/72261698660.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/daxinogujapuzepaj.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c33cde27b9---padujigusegixep.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/1212408683.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bec9b75d3---pifivikigajeso.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51da9f1969---boloramemalumejido.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/kolugorugumilipumapob.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/80879838641.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7bf2c429e---97782193314.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a86f12e8ac08e7a3e5bcc30a67c80713/24631325307.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf59a0bdd8a---bibub.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/wujawefu.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/tegumenej.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c795379002d---rebesajodevujabelijizewo.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608352f8b46b5---finanezatiwojebesenopime.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/sekafarotekazago.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/53223281356.pdfIn PDF document text
    • 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_off0000e515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2C 10692 bytes
SHA-256: 0a4c56dc6e3bf83d57db0f160a2501391092cb69ad90ec69119811018559742a
font_02_sfnt_off000115ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BA 20028 bytes
SHA-256: 40669051a809c48b90976e123760a39f32ed845ab4dd44c9d16c6de6bb425ff5

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