Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd70610dca34f22b…

MALICIOUS

PDF

83.3 KB Created: 2021-08-26 03:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2c12e0f8cc891b0fc96f8c6a8e5053e7 SHA-1: 7384213300df123f51d18b20a3f7b01cec76bb32 SHA-256: dd70610dca34f22b6b72559345e12bf85adaefd9a1f8564b27d3b37e0eae39ae
196 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a link farm and a lure for clipboard command execution. The ML classifier also flagged it as malicious. The document body is unreadable, but the presence of the 'SE_CLIPBOARD_COMMAND_LURE' heuristic strongly suggests the intent is to trick the user into running commands, likely to download and execute a second-stage payload. The embedded URLs point to various hosting services, some of which appear compromised.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • 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://ckrestaurantgroup.com/ckfinder/userfiles/files/pezamimidamimosunabipago.pdf In PDF document text
    • http://agama-rc.com/upload/files/89447203082.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/gufekexigasewap.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a44951db72c---81186307233.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/tepodenuwerajovof.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/nivegitakuvev.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/f7d30f9bb9eea99456983a77278ff0b9/78114218321.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/14537643248.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/b0fnevhmargb85qr7rth9u4t5v/89785936582.pdfIn PDF document text
    • http://sjanzee.nl/file/lukuzegatopudiwejitapekiz.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e627ef4fc4b---21926318174.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/50b62ca25f2ea69fbaad1d3e321883ab/55433743261.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/54800491798.pdfIn PDF document text
    • http://haphadoor.com/upload/files/29056803341.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/vanozuw.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/47670292314.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/xisuvuvuraxelodipirip.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021081510004445.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607219ebf15e5---rarutimozopejepemonejav.pdfIn PDF document text
    • https://samowar.ch/upload/file/96772852796.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/12929201901.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/wudos.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16075f249a719b---76723721791.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0e1c9aecf65b5eafe103e6d3f7402682/20260698829.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/15c8936a68a8d84285c4208f11ab1122/48077593259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=aptitude+test+questions+and+solutionsPDF 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_off0000e36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36A 16604 bytes
SHA-256: e014750a2beaf8c2796a573542ce766c2ee191a5321aa8e96ea787b248ae5104
font_01_sfnt_off00010e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9D 10512 bytes
SHA-256: 003eaf14937cdd11d4181b5865bf9b0826ec439acb0e6d21a39e0d39440a63f2
font_02_sfnt_off00012674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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