Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed78a74ddfc54cf…

MALICIOUS

PDF

84.2 KB Created: 2021-07-02 04:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: eab739b6916555a76ae952ba8fad0ca6 SHA-1: 366c46937ecb7705e7e58ab31f570a924e7bc393 SHA-256: 3ed78a74ddfc54cf92e0985ef239f0f1e912ab49601453936856e94af274bd78
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs and the PDF structure suggest an attempt to disguise malicious links within seemingly legitimate content, likely to facilitate phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://summit-christian-academy.com/scauserfiles/files/vesubenewuzu.pdf In PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/64454216106.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/71894880244.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bd0179035---ximelut.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/89867203260.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/motupusofi.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/47717202856.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/gakozajimekewemekek.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/29248326728.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/gufivubamufeb.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/9fd99f4cdc5a0bfa1447c35604cc42ab/bagavokepapuriwif.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/626b54e13ce2ce148eafb68372996ef6/48978180197.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/guminimagekitabafuvalu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16072556f6e637---kubuniber.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/97628513118.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210619_100504.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/waxexugebeka.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a898ed7ad1d3280acffdb7de18502dfd/fibopudipogalipemegako.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/25277462889.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077eaf9b66f9---xetarefaf.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/pisogu.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/2jt1pplrcdq824pa7bvkf45rp5/lusotusatage.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b8974fa6f2a---78492268241.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=possible+causes+of+lightheadednessPDF 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_off0000e729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE729 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3B 16616 bytes
SHA-256: 5df591339e6548b412c3097759b3fb52599caf29caaf660a5fa222ed2b41ef22
font_02_sfnt_off00012aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA8 10896 bytes
SHA-256: 3c1ec45f2c760563011d67ba0281b581f18afa08a6f9a3280610fdfe6b148b85