Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28d8e2f7e689600…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 07:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f0af481a45469822adfbdf6b1cc1884e SHA-1: eb08a0a0a0bbdead190a8b0b533dd9f85d63fa94 SHA-256: d28d8e2f7e6896005c2161d3ac2324f2434c3d6d3aa875082a3a46ac0fd04d1a
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to external sites, some hosted on compromised WordPress installations. The presence of multiple external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://queure.ru/uplcv?utm_term=really+bad+ear+infection PDF link annotation
    • http://lg-palette.com/upload/files/gewukipimemabar.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/50035572981.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/lapiwevedupogu.pdfIn PDF document text
    • http://boldogelet.hu/media/86245354780.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/5392723773.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/37576891274.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///tevuwufoke.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30e787a923---gimifadomenefonatesekudix.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16077a12158894---95121973746.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b82eb44220---jubad.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/zozufewulatujuxibadalam.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/20159981126.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/9805c6a863650047db0c5aaaa637732c/99905112227.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/tudirisafubev.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e87430306---vejupotitepidusifufuf.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608058eacad99---wimoxasinepedebolu.pdfIn PDF document text
    • https://rm-parketi.si/uploads/gimadefid.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b4233c3c13594f7ae63131713baa9e26/pazedi.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094f129a142c---munivozofafu.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/58581794287.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/046e6359423c6933eab5622637d0a39e/17905697054.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/bapiwe.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/7e26c4eefdd240244be6b687ff0de284/jafuziseveva.pdfIn PDF document text
    • https://baongochoa.com/upload/file/senemu.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/06157b9e4e88435a3ab9733b9c7bedb0/23814706589.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/d3cc2c12cb7906659d293bdbcddc971f/19342304291.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_off0000e70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70A 10600 bytes
SHA-256: 7054e0dcdff0bb3a8d1c5c799cd3fc10e84cafbab615545fcc9be1ba764b7c3c
font_01_sfnt_off0000ff55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF55 16460 bytes
SHA-256: b609afd94c714bf95e627291e122ff024dfa0772297b7092ced2384907783cb7
font_02_sfnt_off00012980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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