Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ecd0bb8b9012dc…

MALICIOUS

PDF

69.9 KB Created: 2021-09-17 12:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 796991840c574d7b7a8a7a87e3910471 SHA-1: c3f9761149191b1fc99ac8d8510336290175cad7 SHA-256: 56ecd0bb8b9012dca0f21083f7c7633638147f4ccd456b31fa8b2a9bc5a46325
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many hosted on compromised CMS uploads, designed to direct users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further suggesting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/uo4hcad1t1ujs2tgbq9hlb3lhr/65462397034.pdf In PDF document text
    • http://sl-light.ru/design/img/upload/file/xuzofivizumikawurodifa.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/nopezemobebutezatiluri.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/67131424791.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/19112296799.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/javoxevobitinilogufinabu.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210905_050824.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/40885757680.pdfIn PDF document text
    • http://jump360.co/upload/files/20210905180609.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/sunonojomut.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/kokijanomitotedo.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/59598950089.pdfIn PDF document text
    • https://adci.vn/data/upload/file/64866690168.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/38434300951.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/28510105194.pdfIn PDF document text
    • http://harlit.com/upfiles/file/xameramolaxokosaje.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/1f34076b3fccb6b2b2dd04a110d65cfb/paripijaxeda.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210902192416.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/lolidonubupev.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/tolekipivameju.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f78806bee1---nimatosokonaxiloropiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=paw+mp3+download+songsPDF 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_off0000b1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B5 15816 bytes
SHA-256: fa2b6bfd82fca99cba20c0b993bf71f32239fe3bcc683b7e24f745b966fdd1bb
font_02_sfnt_off0000f253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF253 10572 bytes
SHA-256: b2738339233cc1e6a1408933ff981732b064e01c6e977d81e2ebb19ee33e9657