Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3bfc08230d2cb8…

MALICIOUS

PDF

94.3 KB Created: 2021-09-03 08:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d06662f9373a1f6b27017b1167bb1a53 SHA-1: 8376409f451216ca9fef5bf881bcb3da8785459d SHA-256: 5f3bfc08230d2cb8cd8771880c95efc6015ac84a7b843d70c395aad87f9783c4
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document instructs the user to copy and paste content into a command-line context, a common technique for executing malicious payloads. Numerous URLs were extracted, many pointing to compromised WordPress sites, suggesting a distribution mechanism involving link farms and potentially phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://smidgel.ru/uplcv?utm_term=weeny+pdf+merger+download PDF link annotation
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b435985e35b---ribuzejoni.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/70593048910.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/882ee7ccb23e994c08e1cad3d16ae6fe/gadavanavobonopobusabobet.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/popufo.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c7928b476---11485054692.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/53163200665.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/42286740089.pdfIn PDF document text
    • http://immopolignano.lu/images/xetipusu.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/e87b936eb10412e226acf7db4455c6c6/13518091087.pdfIn PDF document text
    • https://digireg.gr/upload/51023917947.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f345860888---zavuvore.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/3564777839.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c2be975ba---13559740585.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c256944137d4691d768bd99a04ab14da/79849106148.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/v5ibn9tjobfn0v3m3v6t8l80d4/46255618084.pdfIn PDF document text
    • http://salwex.hu/file/falezijolilojesigibumeru.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/9c1f3bebd3b15d18e6259fd74495114c/simumenonirepowodasineb.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/pelitaxirutiwu.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611b5e7cd4067---xabidedagusus.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/zoxajikagodibotikakut.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/fobofumijugumosunijodunel.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/24325766981.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/sekimiguwit.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_off00010afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFD 10676 bytes
SHA-256: 2da10d85e538f42ee3899ccb951a228e1c01b414b79917dbd66bd62d75444a82
font_01_sfnt_off00012346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12346 18464 bytes
SHA-256: 580d47da2243bf56ba73772bc1af88179a6e617f96deb202d1c479da96b6ae73
font_02_sfnt_off0001536b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1536B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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