Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6183096c0c24728…

MALICIOUS

PDF

79.8 KB Created: 2021-06-25 21:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e3bedcfff1c0f3d0a253cddcf066ffd SHA-1: 2b2a67bfb47a4407fece3f39b2db1c0ef2d1ae77 SHA-256: f6183096c0c247289a5a74ae2e7f0fa41cad85b044c2a5422eccf42a8ac525ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's designed to exploit user interaction to lead them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16085e9287b706---44623458671.pdf
    • http://nail-free.com/ckfinder/userfiles/files/fosasudinixo.pdf
    • https://gregor-biffiger.ch/userfiles/file/20668009522.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/440mc6svupo1aaq0sk192taahc/85669373371.pdf
    • https://hojoairport.com/images/file/46123030868.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/03d1da7558e42ac9355c079d6f11b330/90860662342.pdf
    • http://maychamsocda.vn/images/userfiles/file/85820674099.pdf
    • http://roxburyhs1987.com/clients/63080/File/54554107826.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/6eae9fcd1c2f3377f206e1d0b3902e92/1401321379.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/4af96cbaf43f4b3eb4ddf711cb5ec6da/46461952090.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2697b1e91f---69409012530.pdf
    • https://patriciobanados.cl/upload/file/
    • http://resetimpianti.it/reset/public/file/rojojatasi.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/0156a859da22f5f3c296e3f97a4d3196/62530406670.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/d5929dc32bacfff0dd506ee51e95a52f/13743319922.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f07c5cc777---rowefuje.pdf
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/4027078496.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7a1b5b10b---38879279884.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/0d99948263be66bfd4385e5c98d0afc3/2610033849.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e9f32d7a5---muxoje.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f30c52b82d---fakulasuvekuvixux.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cac43bc5a---xirokuwoniv.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/futusigijo.pdf
    • http://files.ibiza-ferien.de/file/3401534280.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=brother+ax100+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d417.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD417 16792 bytes
font_01_sfnt_off0000ec29.bin
00ead48727deee5ae2f53ae9f6a0430558ec47a34a959e4e4458a22e0a71d899
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC29 17488 bytes
font_02_sfnt_off00011a3a.bin
eee499602ca03e31ee5e54c72e38c3b8557abc44a43a2826089ffe58acd75fc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3A 10544 bytes