Malicious PDF — malware analysis report

Static analysis result for SHA-256 b179b0f908e7ab6a…

MALICIOUS

PDF

93.7 KB Created: 2021-07-30 05:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ca3c4cadcbecebc0c6e266c2eeb6b3b SHA-1: 57f37c6790b75c15dd229e6c115bbf1a23e78358 SHA-256: b179b0f908e7ab6adcbaccc88c99f9e78f2373918538a090aff8c5b5edee32fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's used as a lure, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a90b0e8812f---5711048666.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c129da505ef---dazisawavipijanabut.pdf
    • http://studiosantese.eu/userfiles/files/59956917637.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c928b1569dd---76313679988.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c2761d995---kexitadakofumubos.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/94b7c1e1d08c939da835af34099073ac/24237302799.pdf
    • http://amajyuku.com/files/files/xazedomi.pdf
    • https://isleo.com/i_photos/file/dapefovewadukava.pdf
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/vixuvigipox.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3c8b47af0---petopazipizibadatixisuno.pdf
    • https://living-stone.lu/userfiles/files/79448329448.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e324a2552cd---48069734211.pdf
    • http://tiwtactic.com/userfiles/files/gafivumobitexafozew.pdf
    • http://hiroi-es.info/yamituki-n/uploads/files/4340747275.pdf
    • http://daechienglishpark.com/ckfinder/userfiles/files/44356403339.pdf
    • http://masonhn.com/d/files/gupemexux.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f68a8360a2---nubinuto.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/mi142nn0je9jsibvtlpu6s5cq9/wafulibewelomedadixe.pdf
    • https://lawyerupsmart.com/tempimg/file/51637995701.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/62236580734.pdf
    • https://bikidi.com/UpFiles/WebEditorFiles/file/50318794033.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=formula+para+calcular+superficie+corporal+quemada+en+ni%C3%B1os
    • http://irodori.kir.jp/files/file/dujedifupine.pdf
    • 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_off0001056e.bin
412d80216867fc5e9d00ee2a3c0365ab20782dd5ac299851b2ffd306c0d81e66
pdf-font-stream PDF embedded font (sfnt) at offset 0x1056E 18492 bytes
font_01_sfnt_off0001344d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1344D 16792 bytes
font_02_sfnt_off00014c64.bin
5dd73d285781c965a7698f96be9117886e9d3c64267b737d4ff6c3b31a1e73ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C64 11112 bytes