Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e5f3d51e52475b…

MALICIOUS

PDF

89.6 KB Created: 2021-09-02 10:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: abba68fdfb610f1ea422a58ccd05479b SHA-1: cd67039af38663c17c4ae778ae9222269e37b70f SHA-256: f2e5f3d51e52475b216a3dba3b5ee7ec1825511d339b99e062ce940721b0cc70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://smidgel.ru/uplcv?utm_term=is+54+too+old+to+have+a+baby PDF link annotation
    • https://hiroyoung.com/data/files/30598381979.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/99950598406.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/1cf91bbf45c3d140c97d8c940b880a89/33219067981.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/venew.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202106071019203901.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/opei4a1cqtmdeqi135v9v770sk/40146767776.pdfIn PDF document text
    • http://hongquangled.com/upload/files/padogeli.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/zivavadenikepabumemotu.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3b4ed95bd---nujavixizimizolomaxaveg.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/gs6jf2tses76779ag3iirpfqla/girujegidatipofasarobox.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1bf7dd07e75b15e7a7bc1bce06eb9b83/87368563400.pdfIn PDF document text
    • https://serka.com/serka/upload/files/48211053368.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/jokugavotafup.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/mabemaxufejisebenano.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/616a9dd19809e5ad68afa47207ea2422/41997280016.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/falulenadolejatesexitu.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/2647768056.pdfIn PDF document text
    • https://koratspring.com/upload/file/nefavabak.pdfIn PDF document text
    • http://refta-bg.com/userfiles/file/86814823178.pdfIn PDF document text
    • http://cuacongtrinh.vn/upload/files/97997124906.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1f6380f8c---kofozefefud.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/21154050289.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/43233924661.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966828dd064---46835611149.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/zerubunuluzedigamedawas.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/13c3ebc2da98da9250b07963a8fa394b/nagibugesupufofexu.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_off0000f88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88B 18020 bytes
SHA-256: 10b1d6cf4e3ac18784a634753151f5a2ffa98c6b97d884468f91530610de4deb
font_01_sfnt_off000127b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCE 10532 bytes
SHA-256: 6e027cafdb8e4c8b58509a3034892e1bb86b467a579f5d743f109937e4538d01

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