Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf35d204b4fa837…

MALICIOUS

PDF

90.6 KB Created: 2021-07-14 01:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8871e8841f0b5bcb93a38954352a75fc SHA-1: fbd9dbc8a0eef2ca73ba5121183d2c24b73425e2 SHA-256: bbf35d204b4fa8374779e483aaae6676959e6608938e5a35da088b0ff741560a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed as a link farm to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs are sufficient indicators of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087af59e753a---kuxamuka.pdf In PDF document text
    • http://lamexmarket.com/uploads/files/83674685083.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/zoganepikexivegugar.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f10cfc56---timinopotu.pdfIn PDF document text
    • https://istanajp2.com/contents//files/demofadelageb.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1024860157---1302635153.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad90e727db0---pagugabaseguvonenexut.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/44905758519.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/kujubaferavamof.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/tanuvidazopok.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/djsb4juacfi47e1utl4red5ud3/55807450894.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/7h0d8qs6cp18ncegnhnl3fff8e/xorimefajutodorawojube.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160840979d1a1b---xuvuxakekafegofasopusus.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/jofapujakavanuwuniku.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5c37ca9bb---dikizatinenep.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/stjn53on2ks0lcm99rhv6fq4s5/72615913253.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c688cab9d---13116651201.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6369fe442b---73662167960.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/f5otnl3fup5a3e6f21po4mon9s/dadutatarasogovowomolawi.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/digezowadolibaboviviwi.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/19528036193.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/94a038c08db791328e69b4bc8241b049/nirezisumenadekijeboxo.pdfIn PDF document text
    • http://valeneighbors.com/userimages/jegovamimujunazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=band+hero+ds+song+listPDF link annotation
    • 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_off000100e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E7 10580 bytes
SHA-256: 0be6e0c1bbab1b50927533d596549ae0def26b02d3c3d0bf3b02577e996f5c31
font_01_sfnt_off000118b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B8 17168 bytes
SHA-256: 4a91893b5e20330600573f9236e5c1500915a3de1ad18b579d58aee2e351f1e8
font_02_sfnt_off0001453c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1453C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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