Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3cc66a79544193…

MALICIOUS

PDF

84.8 KB Created: 2021-09-02 22:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 03d10a438fe359119cd337b6fe008bac SHA-1: 82d4818e2287b4526688b1af1a412485cf27a9f6 SHA-256: 7d3cc66a79544193bbcf16efe5b3327c8ef3920eb107c55137e9a281d84589ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests 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 http://broadgatecapital.com/userfiles/file/99848854974.pdf In PDF document text
    • http://fmi.lu/userfiles/files/12755459222.pdfIn PDF document text
    • http://cooleywestbrook.com/clients/865832/File/86512271232.pdfIn PDF document text
    • https://samowar.me/userfiles/files/vabasaforazim.pdfIn PDF document text
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/44188743980.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/b12075f3dcbf8ac846674435b69f0fbb/bukolon.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/50974739841.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/950422dc5cffc4ceeb6708d823b30f11/82124897172.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pcbhqd8mmmiktjm8grgmcf4ih7/71011386580.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd428b848d1---27167247494.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612726a54c9a2---birixuwep.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/xabomosizazugapujukixuwil.pdfIn PDF document text
    • http://xinyuemu.net/assets/202107/files/20210719070423239796.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/14489525991.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c3002f8df3c---mavibu.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/bekugukupobet.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210609234452_1117591947.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/82176099.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c448293be7d---mazizugomegalaxexezale.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/filate.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/14055773294.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8eb5d1db9---67242086013.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210721150436.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/84531340981.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/wagoran.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/3dc24795bcf04e83abea5dd7eb5c2a5f/kekoranibat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=jedediah+purdy+after+nature+pdfPDF 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_off0000e77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77D 10464 bytes
SHA-256: 3c8e44c8e547bceade4b336c5353ecbf0b15db98cae54c79e9c36113b0769ea2
font_01_sfnt_off0000ff36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11748 17656 bytes
SHA-256: 97d09a3723a6cb2315ec8ec9c7e431da70df3b0f73bdb3bf9291f8397bf6a20c

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