Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f0883cdc3415ec…

MALICIOUS

PDF

94.6 KB Created: 2021-06-30 11:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 26dc171d04be0c89a4b678156d9b8a0c SHA-1: 31d7321e0117c1cde2f3684d49b5bfca627fc7cd SHA-256: 75f0883cdc3415ec1686105cb76585978b3275f9928e83039e4235e02c0e20e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/0d98d6ea6cee7fe64bb9408e4fc21b4c/jitegijuxaduforagevosej.pdf In PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7d7cb9760---sararaf.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/55c2bb20cb905b2c8df84b1563d6c547/23044304206.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b855bd9465c---gukodinimekalaz.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/209f11504359c06ef27da33884b2d41a/86893378403.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/9e3ba9290604770a39f8134c38da248d/xexerolenamatawarabise.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724aa137ad6---jafipejexenexoruga.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/xusomefug.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c6eaedf2f---norere.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/dvgjrq14v0fud83io1ca29eh61/69006408829.pdfIn PDF document text
    • http://change4best.ru/upload/file/sinexagenujid.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/nakasazowujabidabi.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/11251286795.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/ac294687b8b8826e62a918b34c374748/19627053325.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fijefidagup.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/61477838822.pdfIn PDF document text
    • https://abeess.com/userfiles/file/488695782.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160739fd6835a3---24470612930.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073118f62e2e---xokokomuwetagasugawigoxa.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/6fde9971c5a4b51e65ce1c1a07654271/54420051697.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822415bcd02---mogifetobekojarovanoxala.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/50ed7a560e2d04c8aff95834eac1c61c/49659869358.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c967ede7a6a---29957967887.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/605b32d38725c70c8658ac90047de731/51396208568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=happy+birthday+quotes+for+brother+in+tamilPDF 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_off00010fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE6 11252 bytes
SHA-256: c8c082b99826848f468c8e7616f8e93892f93141f9d6952bad76554ef614ec69
font_01_sfnt_off0001299c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299C 16780 bytes
SHA-256: 7101795ba8ed7ea38c34a465ba5340139ce5347d45f3e36ab4664ec111f79d02
font_02_sfnt_off000154d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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