Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8c6e608ccd136a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 11:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a57ec227dcf5ae8bdcc2cad8434ff703 SHA-1: 4bb31e46ee0d3b4ce10297a227f4af13c28a618c SHA-256: 3c8c6e608ccd136ae8d39c6384798e2cbd8fbd3669af784c4f42f3742ad16e94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites, as indicated by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://huntic.ru/uplcv?utm_term=watch+veer+zaara+online PDF link annotation
    • https://signos.larrialdiak.es/files/galeria/files/weriva.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/16925092032.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/jamametamegenino.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/53305176855.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ba7d90ff3---88236240148.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/48058540624.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/bipijutudad.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/kosutozitupafusifuxiziwu.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/80397736875.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/isarojivixaduzowuf.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/jivekudazigoviv.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41318286009.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/62496716720.pdfIn PDF document text
    • http://pjteam.hu/uploads/ranunixibubuxajusezeki.pdfIn PDF document text
    • http://identik.hu/editor_up/90085955761.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/zarinanerivifegaxa.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/94479021885.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/39382399198.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135df7d6782a---12658924386.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/sigitososamuxaz.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16145af4a4869b---76982480939.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/vokaxozugikomum.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109090427414007.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_off0000d8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D7 17844 bytes
SHA-256: 060c53d9625ff26e01f8d73882316b7b7fa7fc60e726575af13958dc43dc90f9
font_01_sfnt_off000106fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F13 10276 bytes
SHA-256: fa54176bbe96a40bd5a361c584e1f40da639cb515edb263d018af0a9e4940e5b

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