Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f670c4287e3e0bc…

MALICIOUS

PDF

102.8 KB Created: 2021-09-04 12:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 45031af672267ad8c72a1d758d4464a8 SHA-1: 80d49a025b9bc29a2891f271c6a704a58da9dee5 SHA-256: 1f670c4287e3e0bcac17f7c29f3f494dc9d32588b6313f7320e9fd3553e0948f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://crysiq.ru/uplcv?utm_term=identity+politics+reconsidered+pdf PDF link annotation
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/6c2a2qk7eau7bh6oq5h5l2uka7/xotamidebitibob.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/lm0mgsjgvkje4u481khkq9j57q/ganokuxinusagupiso.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/siselilebatupawadufuxuras.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/buzetagola.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/muruparukejilikar.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160900b0770f6f---56412081092.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cb5b2760e---gerivunipabetagobiteseti.pdfIn PDF document text
    • https://actorconseil.com/files/file/penegarakukogal.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/56083964370.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/93310959426.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160daebbfb9e9b---55615999879.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/59420014117.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ded707cf19a---kipukiboparesez.pdfIn PDF document text
    • http://eksternest.be/images/file/mekigojitivosovo.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/gesenevedonumimapi.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/3cfeeea5cb4ff88a371b25469e8dbf55/961112274.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/6f2f67bf0b1bfff8516e7777bac2ec0f/pelolufagulibokexobu.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/92982922332.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/92195802791.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/24537531951.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160701f1f24808---subupesirupi.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/10801151208.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/rogeteximizitakenomugizew.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_off00012a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A96 10516 bytes
SHA-256: cc41bd97db4af6c9bd0a504572dc4e3067f978293e3157a157d2b5a824cdbcfc
font_01_sfnt_off0001429d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1429D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AAF 19700 bytes
SHA-256: 8ca1222d1912a1e0b18f8a0772d959114b2b00081843167fb28f514824871217

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