Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a5b7620735e196…

MALICIOUS

PDF

73.5 KB Created: 2021-09-17 19:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 90162cb501387712171a56775fe0509d SHA-1: c228bb58486a11b3021a0bd5d6fc298d6423cc43 SHA-256: d9a5b7620735e196b8b929b6773afc171c498a3f7537049c9ae0ad87c0935e5c
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to potentially harmful content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://playoz.com/ckfinder/userfiles/files/jazewupi.pdf In PDF document text
    • http://pactolous.hu/upload/file/33352026542.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7aa6e7bff---67474588651.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/nabarutotunuvizomisu.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/moraboputatuxuruke.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/desefariganolotokezil.pdfIn PDF document text
    • https://zzwgjx.com/d/files/41833269672.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/88331454396.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/f070e187be50fa062d64180cb74ca253/gijavodoligedapamimisadup.pdfIn PDF document text
    • http://kesifveotesi.com/files/bifoletu.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/51867763264.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/gefetetunemategelafedabu.pdfIn PDF document text
    • https://fasaac.org/temp/files/zorapasa.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/jozonusofedetudalolunid.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/f2920abd5545a42b2be7b72baa1ac05d/birudusewogugonixigugoto.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/robepirubememeje.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/35951490315.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/66686315573.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/renumarotujun.pdfIn PDF document text
    • https://senegal4d.com/contents/files/10028135297.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/wujenekifujikujoxexe.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/86803311156.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109151848446262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=norton+anthology+of+drama+volume+1+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_off0000bc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC01 10996 bytes
SHA-256: 52f0078e24afef248a73798833306f7f0b2c7dd17ee48ef27507b5904341a80e
font_01_sfnt_off0000d540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD540 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED52 16660 bytes
SHA-256: 73d322e198e2e8cdbb2b3230613ce800c8ad9c5a75567f66a510de703e5b7a0e