Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b03c7e155c9a8d…

MALICIOUS

PDF

77.5 KB Created: 2021-09-15 15:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 65b4748cbdad3474628a856f42943259 SHA-1: b4a0ea83867e257f35a67491d32fb3cf044f6215 SHA-256: a6b03c7e155c9a8d563a434f28de5e91193c1928d980e3ee8fc42fcfa1329d50
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.001 PowerShell

The sample contains embedded JavaScript and multiple external URLs, some hosted on compromised CMS platforms. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy/paste commands into a shell, a common technique for downloading and executing secondary payloads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://queure.ru/uplcv?utm_term=security+and+compliance+center+login PDF link annotation
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/05dbf952fdc2d1f96d997454e4b0de45/vomatibokafitafuvelodomu.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/866704339.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/fumid.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/lowedexojezowuxuwunujugi.pdfIn PDF document text
    • http://coolscape.info/images/files/4530922432.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/34958612862.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acaa5d202d---67792705509.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ac26e16e13e803f8c7dda658e624fcf8/37520275826.pdfIn PDF document text
    • http://findacommodity.com/upload/file/57820348861.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/63980327708.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/popetebu.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613931c71428c---9591580061.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/91906182307.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/23409684730.pdfIn PDF document text
    • http://imbirimbir.ru/files/nafozutotufuluseborudip.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/tagevupawubadomeniwejirew.pdfIn PDF document text
    • http://labradory.pl/file/wagabaxotefiwejupatosot.pdfIn PDF document text
    • http://93564497.com/userfiles/21523087722.pdfIn PDF document text
    • http://bdnchem.com/upload/files/bofabopudegusubega.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/vosuwafaderetafafimi.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/40723721848.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/gubumukom.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/pupoxixamedazemevalonu.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/66504317598.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/votiziwawugafokidemiwam.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_off0000c79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAD 18388 bytes
SHA-256: 74b08d32ddae1a00ff3f77dd8102b60bac474f404fc33cc3c7a848b8e215b2d0
font_02_sfnt_off00010f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6B 10980 bytes
SHA-256: 499979e522cdd5cee29cdbbe9eb40e5c39fd0055c2da1daa214f6d7eacd2566d

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