Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23fc7a6a10a4e0c…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 10:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ef12459073d761a85cf2c2f772599c1e SHA-1: d7a4604ad4e0b4c572ca121c417b298799e78523 SHA-256: c23fc7a6a10a4e0c42a9a44a5af1a7e9b07839a69de54102223ad2072985ca49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute malicious content. No scripts were extracted, but the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/036d6cef82c5a718df80c57be73068a1/babodasov.pdf In PDF document text
    • https://mimpishio1bet.net/contents//files/guvafopapuxipa.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/fefejupabuz.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/51183373250.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/73485186385.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/25156569223.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/14551316555.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/99857794900.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f76c030d2---ruxovatedujawusigono.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/9535403353.pdfIn PDF document text
    • http://mahlkoenig.nl/app/webroot/files/userfiles/files/5764892330.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/muteturavenalibazemexane.pdfIn PDF document text
    • http://jinyezi.cn/upload/68280494776.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16106435ceebe0---sikidubugetewo.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/190bcee8a80dce790fb196b199d5807a/kifakomizikiso.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/12909245358.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e934a436639---bifabuwofafonedigefile.pdfIn PDF document text
    • https://atrax.hr/files/34878086876.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/sodevokopo.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/43d1edb784cea88c18eb5d88a99bf787/87178785346.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/xatewetikamu.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8e78e4f22---datos.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/81921991272.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aabf664a805---73595610739.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=arduino+cnc+shield+grbl+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC042 16252 bytes
SHA-256: 0295fde54f33375e71b312635bb5aa3d847439f716fa23b213b1a2a317692eea
font_01_sfnt_off0000d651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD651 10860 bytes
SHA-256: 8a2ed79d9089dc5609d6689f51c372d486268346c71387c0ef492d796d96587d
font_02_sfnt_off0000eed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000106e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E8 20948 bytes
SHA-256: 363378e2af45f2d78b532191caf491c8ff6ee0d4b31e85a734b601aede87755a

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