Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a30f9313bf2f34…

MALICIOUS

PDF

86.4 KB Created: 2021-09-21 01:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4d0f9aba1c018a1653926a7ed84e5007 SHA-1: 552142657bf069fc90f7e50f0339fa11919ce284 SHA-256: b8a30f9313bf2f34e5749748f3a88a65841bac8208f85c9d1cc1ab80883dc0f9
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains heuristics indicating it's a link farm and a lure for clipboard command execution, instructing users to paste content into shells. This suggests an attempt to trick users into downloading and executing a secondary payload, likely via PowerShell or cmd.exe.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140dda40e408---80282220338.pdf In PDF document text
    • http://finara-v.com/file_media/file_image/file/58912856246.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/33b1414cec8a91ce84f154379344ce25/bemosabipa.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/4631336892.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/jaxemebawapoxus.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/zikakuwifobususejufopil.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/c83nvpi8r2n82f608u7q6okqi0/xefukir.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/xadonokikufifi.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/qboihidu67q6i38ogchmiioed0/wagafase.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/zijasukovogijalaw.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143a4877ba57---73994269645.pdfIn PDF document text
    • http://maksimetall.ru/files/98122143046.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/18325820237.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/70421128482.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161446198da220---26012854163.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/lalegedijozipezobenakigi.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/bisoromupisipabasudarili.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/33319792843.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/90801585209.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210920055719.pdfIn PDF document text
    • https://penzion-palice.cz/content/radeziwarovewiruzura.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/88899579079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=download+windows+10+pro+32+bit+isoPDF 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_off0000eac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC9 18488 bytes
SHA-256: a8b16f8a724dffe0cf6c6fc51a7a359e649b1593291749b506960981a7fa3ff8
font_01_sfnt_off00011a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7E 10944 bytes
SHA-256: cd80c467bbf31f94f24595d01423a9eeffa7629a0dd53505aa125d7a53b7951b
font_02_sfnt_off000133dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1