Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd603ba4e9255583…

MALICIOUS

PDF

93.5 KB Created: 2021-09-06 16:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2746682990efa7922b9dc949277d5fe0 SHA-1: 2939e149512e0403ec21ec50eb5923109e5e97a1 SHA-256: bd603ba4e9255583b7d38c8ad2b2ef001374e15b138691e7ce21653c0d44e396
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://smidgel.ru/uplcv?utm_term=werner+sombart+lujo+y+capitalismo+pdf PDF link annotation
    • http://laulumaja.fi/ckfinder/userfiles/files/xizudojabokipisimiwimap.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/zokimalijevodazokulikeb.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/81667553802.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/7465b4ec3efe3ed6cad78e5d8e39af0b/wevelijupebabogoboguzo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/gtogdvspqf1bi51qcoom5jroa2/70404381204.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966229ce1aa---40903418269.pdfIn PDF document text
    • https://senhewood.com/d/files/88356981874.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806d180af45---ragidunaxazan.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/e8c245f1bbe032718d1743d9ec8b567b/78092494077.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2561979d44f15e5f8af65fabf5ad0f01/75526324633.pdfIn PDF document text
    • http://wohingltd.com/userfiles/99678878923.pdfIn PDF document text
    • http://humanlitech.com/files/files/pelorilaviji.pdfIn PDF document text
    • https://123natura.com/stockages/files/nuxerujesujuwunam.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/92978522193.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161296be67f707---luxak.pdfIn PDF document text
    • https://invest.pl/userfiles/file/52197090284.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/74483056202.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/33350579066.pdfIn PDF document text
    • http://gaudi.tw/upload/file/71948618432.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ecbd34c7b---98247873692.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/5fe9i4lb3hrrlf3jk9pph82oln/kulabinojegim.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f24dcd05f---57135130988.pdfIn PDF document text
    • http://www.ntweac.edu.hk/admin/ckfinder/userfiles/files/lebaropijumiv.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_off000104e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E6 19628 bytes
SHA-256: e64bd24b1858776b4a8997f212d1c62560513809545d30a51e80791d6ae2b9b5
font_01_sfnt_off000135fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E14 11256 bytes
SHA-256: 5c47e86865a0974c4697d8794dafc4b76efb594cff059e601da1d069493bd96a

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