Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a7bf71641d01a5e…

MALICIOUS

PDF

98.4 KB Created: 2021-06-29 23:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 775ad9724f18e5068b90ed683fd3f3d1 SHA-1: fbb6aabae4b038f3d469cde1d38891a98aa06560 SHA-256: 6a7bf71641d01a5e3e729056ab08c495280de173b8fc82653d23b42c414b0960
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host links, potentially to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://inwebjor.ru/uplcv?utm_term=song+id+for+muffin+time PDF link annotation
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/981b13835449dcda6561f9c9d81cae5a/45931247064.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/3669389759.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1b5f570cbf204920162b30f224a2b5d3/10195050038.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/2cab2ac74cfb0fd89cc0cffbfa780067/19254370264.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c47de1262---wijazivapajisarumu.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/23670219725.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/robotipufeginawobafoxazor.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/2f5b52e2f2fdc87a085b84d14a599037/18164361192.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c940da9a14c---fomorugosopokejem.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/vaxuveviwifidurub.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098803c3c3cd---mazuvogi.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/raduvodajegusumejaka.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c258fc4625---36463736134.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/djhlkgaq9il8pilbb0mvll7ij2/dotab.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16086184e41664---pamovavarewozuvovilo.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afe0dde7b74---95373241627.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/9d41b6750840826485cf8db6f9b6825f/lonugivetirep.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/2f3a3e83da59aa7c2f2ee5ea190a0017/zugewuwijazegusamasito.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/tejoxutonarasatajupomumu.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/gebolirudijediput.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/6cnar33hbnsuc37a7laphoarrb/57693211360.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6a8ab936e---53067287941.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/8e8tqrgqvk7hfmgojknq46nnot/nitolidufol.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/luvegum.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/js48b2dab8835e00rnkstushb3/6742189982.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_off00011ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE8 10496 bytes
SHA-256: b766ed8457a12eface07232c63cb9d08e98b9f588fbc7ae5894f964318ab0913
font_01_sfnt_off00013692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13692 17360 bytes
SHA-256: 142c6062188df7f69e4249a806838c6d196c04d8139ea8239b9fdc10d4c60f3e
font_02_sfnt_off00016415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16415 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1