Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c84dd8286f45af…

MALICIOUS

PDF

80.8 KB Created: 2021-09-04 17:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9601c9f1f150b3347e2b0331f4bc817c SHA-1: ca422e71da272d7a894785584769ed97eb119bbf SHA-256: c5c84dd8286f45afcd68180405c84805c44bfbac190413824688452a265f58e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple link farms suggests an attempt to obscure the ultimate destination or to leverage SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=book+review+template+pdf+free PDF link annotation
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/26630725091.pdfIn PDF document text
    • http://damutech.kz/upload/2021/08files/2108260501383173528crgf.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/52550988457.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/2057c684ad3075ce1dfa0d61e7738aec/kowazaxedupojal.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/xurixi.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070257a61609---wevufipal.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/c71ef7e9d55644a2c87b09aac5b84289/figadovoba.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/59684621671.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/d53521395130a77cd48908af447e18dd/larakafakebudefalarakut.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/fotopetidawu.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/sawopomilosolunug.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/ae466a071eed8f2905dbbc803d55ffcb/lisulawitusidun.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/rolowadekubimiresu.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886a43b4c91---gagudazanagutenu.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/wizovadi.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/rabobuti.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/45bc773c0f27009263bf4752730607cb/90986977784.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/a6405cf032d74d21edcd6b267abec8d8/famufefajuvivoxilisokat.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/20021089503.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/debigapipimiwojerevunusew.pdfIn PDF document text
    • http://ubest.ru/images/file/zudumelofilijapixakuka.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/kipijanelokumori.pdfIn PDF document text
    • http://nova-auto.com/upload/37151035853.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/2776472697.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_off0000d9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E2 16676 bytes
SHA-256: 107ff7aa3e737e8764c4dd9f820ed4c65f1b6b1711cdc681862eb28c3c2521a9
font_01_sfnt_off000104dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DC 10684 bytes
SHA-256: dcaeedce8efe5c43fd083d52a0fd575a0375d021fae2061e38860b7427e7764c
font_02_sfnt_off00011d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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