Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa3b4f6675d83f5…

MALICIOUS

PDF

84.0 KB Created: 2021-09-04 12:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 55589a145dd81bea10f4c90715bf85f7 SHA-1: 01e1cf50c99a0921e0f3dfe15a22e78082e1b9db SHA-256: 6fa3b4f6675d83f5349ae3cac1875ae84fc209e2a7ad2f4ebd8c8399faf3f3f3
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it contains a link farm pointing to compromised WordPress uploads and other disposable hosting, and it explicitly lures the user into executing commands via copy-pasting into a shell. The document also instructs the user to provide a password for an archive, a common tactic to bypass security filters. The presence of these elements strongly suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://contactfm.be/userfiles/files/8566655235.pdf In PDF document text
    • http://studiovalentini.eu/userfiles/files/digotejuvidivarunaxigan.pdfIn PDF document text
    • https://stbenedikt.ch/userfiles/files/10559924381.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/83304832394.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/solovamuboberojarawu.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/46624818019.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/toruw.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/juvasexadiw.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/41596178222.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/webuxeb.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5e32b462c---xenijumoturewut.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe6365d561---nudukefugevefav.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5dbadbfee---tewozup.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/jevofegagobekimijew.pdfIn PDF document text
    • http://altinay-law.com/images/file/lutuduroderamekavunugiz.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/38067190633.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/48370793522.pdfIn PDF document text
    • https://biocoils.com/img/file/bulufajarajupa.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/45438410315.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/92512229339.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/sosuxagidumerafusolinapot.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/fidezadinunejulagala.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/fe1bb18ab1f6996cb5a4eacbe953be79/21035950858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=sample+one+page+pdf+filePDF 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_off0000e488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE488 10552 bytes
SHA-256: 383c8c71ed22674fde9da5f65893001fb15ef4f15e91ccaeebe1db140c873b5e
font_01_sfnt_off0000fc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11453 18072 bytes
SHA-256: a5ffe26f7bfb75c4233fed8b57cdf602a3b93c86c25e5c45e7d87b2de86534c2

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