Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f35b72731e16b77…

MALICIOUS

PDF

73.8 KB Created: 2021-09-17 15:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 490aae414d5d753fd3c5197e17f33bfb SHA-1: 4c12311079a20e932365118bb06d915cdebde684 SHA-256: 6f35b72731e16b77058a10d683aa39acc13c719eb5bfc77edb26a60e71997396
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URLs, many of which point to compromised WordPress sites or disposable hosting. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a shell, a common tactic for executing malicious commands. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://best-label.com/upload/files/futitatiz.pdf In PDF document text
    • https://livewireeventz.com/userfiles/file/fonokimetudijubakaja.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/19064356054.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/35762136484.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/kufemag.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/517c4593aeba594f469e45cd4efb5b80/96774395849.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f829d2d09---nekibapovirowevenadobuxo.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/eef2ef55d0073cdb29c0ebd5f2353a28/befusuzezoxomoleliv.pdfIn PDF document text
    • http://erictex.com/ufiles/files/dopot.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/kapokexaxo.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/20402312174.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161420ecc22b43---96032666008.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/wiraronazozawefiromuse.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/18324715123.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16138de2292700---vebubemimadawufisu.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140a81283601---zubeziliw.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/dodemota.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/toworelejegoluvuba.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613686ef0f04c---serededajurufif.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/9188rl8o77jpoapa57q8f6cdth/47957861727.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/40388595533.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401d3bb5a85---guropisikuzusivuto.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/3512932401813410c30e035ec4a723d0/fotababusol.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161410fbc593ac---36283947388.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/tilajafowitoseb.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/kimudelatezen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=busybox+installer+apkPDF 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_off0000bccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DE 16940 bytes
SHA-256: 94f8bdb371c659aeaabb756da6105649e3e0141c12e2173761b43eaa3adc8b66
font_02_sfnt_off00010088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10088 10848 bytes
SHA-256: 64dd7e532e21ee3983c63bfcca97f9b0d81a7edd98fcf76dc08314763fc80691