Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e1965fac5e80bb…

MALICIOUS

PDF

85.6 KB Created: 2021-06-26 10:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce90941d170cc3552d8c055e71ae9c4e SHA-1: 23e275efefd2537933a4b244dd7615c5d56e89ee SHA-256: 73e1965fac5e80bbe9a62fc9be7316d934010adf7ca7b89266c5e1a4e1718eb8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of a 'Clipboard command execution lure' heuristic indicates the document likely instructs the user to copy and paste content into a shell, a common technique for executing malicious commands. Numerous URLs hosted on compromised WordPress sites suggest a distribution mechanism for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a36aa8912ad---16399729537.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/9226ce2aac057fd75875a0ce6f19ebd9/78180345335.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e77f4a2ec---kokizokuxonajeko.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b03aa8bced9---69781195903.pdf
    • http://atdawnwelift.com/userfiles/file/zigefibapafeledabagi.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c3094a6ed---5499138260.pdf
    • http://bean2beenefamilytree.com/clients/60578/File/8144749754.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2d076e101---bozowegese.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/o2maaod78l8qekdm6l6sip7i1g/kerakezowido.pdf
    • https://samarpanbharat.org/trila/userfiles/file/wusojaruxemumexi.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a988578dd0ca08c8a84c4091f798564a/tobajusapafanujasedunod.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/01b6eb53f988a1b176dead5b22e767bb/puwowuvetija.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/25onb5apjgj9uo9skp56cf4k8m/nironebomobelolis.pdf
    • http://shreejians.com/userfiles/file/jufakuwumaxinipewu.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fed70f1a13---70796926768.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b89a730846---zumopefamowupan.pdf
    • http://designpavelzapletal.cz/files/file/mikenatuxejoravanobatiw.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/0dcfc51adc1fbfe3e3b63135d361853e/zepovuzediw.pdf
    • https://tsegypt.com/file/95428449984.pdf
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bipelubi.pdf
    • http://kubabus.cz/novy-web/upload/file/19238693685.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/niq2531o9ml3rit1sf6tqa3oi7/degogepoverozafakojafu.pdf
    • https://twr1115.net/files/fckeditor/file/giwejuzudanesire.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=loteria+real+y+new+york
    • 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_off0000ea1c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1C 16792 bytes
font_01_sfnt_off0001022e.bin
86823dfa51935ab6bae7578093e93fc825d1378c6dbae1fb690c97fa37ecc056
pdf-font-stream PDF embedded font (sfnt) at offset 0x1022E 18752 bytes
font_02_sfnt_off00013207.bin
851be8d1ea64dc2b36a06c4d19e13e6e82dd504d024c16edc5fefb9be6c3cef9
pdf-font-stream PDF embedded font (sfnt) at offset 0x13207 10184 bytes