Malicious PDF — malware analysis report

Static analysis result for SHA-256 45bc315502e8323b…

MALICIOUS

PDF

90.3 KB Created: 2021-08-12 05:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b37c566cf60cc714da71b9735a5f7309 SHA-1: d5ab9aba3f8289a3f28f36a1f6e7c357abae7b1c SHA-256: 45bc315502e8323b8c011d193b4b562006dd881b5c9481800d18772bf0f867aa
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to manipulate search engine results or redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are consistent with phishing or SEO spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/50689cb71bb29dc967dc747877137acd/xewipuwakagaxifutulovi.pdf In PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/c15e15bd3a8559327c10460100f138e6/34884964438.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/vumowuxokav.pdfIn PDF document text
    • http://phsbulldogs1966.com/clients/8/87/87911cb64b10f66d93d15f7b6e22d365/File/sidufulezojaz.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610b1b13a4b29---punovejigixisiwolirudif.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/1113129537.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210531_035838.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/63060786884.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/vutojewegisalelora.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/10121731071.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/pujufelamevafopezavesol.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/88225008182.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/794850c39597523de34d42430b254866/95045680388.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/zumipuwifime.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/24278657276.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/b633143fe65a80d4ad35df94f1bbf498/3441866243.pdfIn PDF document text
    • http://hanleyresources.com/images/zewofodekusafudosigixakiv.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/lulawedijilonexanagefinu.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/kiwufuduxonijebizowaw.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/suwiwi.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/zobuzirapaw.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d3d7e5327---miwajoba.pdfIn PDF document text
    • http://calisnt.com/uploads/files/donosarufojo.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de45bce1fd8---74202306983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+use+asavea+bright+whitePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EF 10620 bytes
SHA-256: c25ab16b8381db11796e6aa1b3a7195d2ab82d148e6076f248e2b9dd18c69d5f
font_01_sfnt_off00010c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12487 17564 bytes
SHA-256: 82a47e48af893df28cf858b724b2043667bdd287c9eb4b531ed47c93de8c4b5e
font_03_sfnt_off000152b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152B2 1776 bytes
SHA-256: 1092c062515a0e7c9fcf1de286437c915e481785be0ae9a2f6895ca910c008c6

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