Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c2d5b3c5c858caf…

MALICIOUS

PDF

80.6 KB Created: 2021-09-15 08:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1cc7d04472a976b807d6896a2ae7ccfe SHA-1: e41a60c363122f3828bf6d7d5d803e2657bd2517 SHA-256: 6c2d5b3c5c858cafb0ea7f10d0e6639dace958a802bfbe749da0696cfbabae1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, with ClamAV identifying it as a phishing trojan. The document contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate an attempt to deliver a malicious payload or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://synerhu.ru/uplcv?utm_term=nutaku+modded+games+apk PDF link annotation
    • http://www.valathors.com/ckfinder/userfiles/files/demonebobibetizez.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/dukuriposivumisapumom.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/30910234342.pdfIn PDF document text
    • http://schokozentrale.de/idata/saxenezujofetazefox.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/23265327257.pdfIn PDF document text
    • http://halaljones.com/uploads/files/66641593899.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/92557684544.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613eddd38237b---bedokekomirituju.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/38204581287.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/41026698525.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/4a69df8e82063482812913f02e35dcc1/52233678859.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/lefuguse.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417be666d27---bafove.pdfIn PDF document text
    • http://salt17.com/userfiles/files/siruki.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/natog.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210911105536_89f2x9.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161408864bf2eb---92812916529.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/7432775929.pdfIn PDF document text
    • http://snsi.jp/image/news_file/53705886198.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614139c0022d2---simolafez.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/35772835900.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/buvakurapijudala.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_off0000d7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 17620 bytes
SHA-256: 117f0f115fa762f1cbf403ddad032b24877e6e2ec47814543023c94f0d823ba1
font_02_sfnt_off00011cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEA 10564 bytes
SHA-256: f337726551a36b68ee6f6f48b69ae0355a1e1a8bdf0884bba0367582c0b89d08