Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e401ab56025eb1c…

MALICIOUS

PDF

77.4 KB Created: 2021-09-03 20:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: af5c74c5530d46464daf9d34e82d508f SHA-1: 6da929917c3ee8305b6716740ebc6043e673a7ea SHA-256: 5e401ab56025eb1c4d401cb9510b2270a302bdca3b95b06efd8dd983fefd7965
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The embedded URLs, while some are marked benign, are part of a pattern to direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928eb585ec4---mozolajuzidapajexowasu.pdf In PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/44163f185817ade05c7b693082a93594/rejexivupafizoto.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/potefunekumenidal.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/10930128461.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/v7g6i75h38jqknrd2i8i5999e4/37748933258.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/61992538381.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/c29c479a54a36fa9c5b456ed90e0309a/1045837337.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608862edc8745---26277657722.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/gofadotabefazijetutur.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/524f2fefee9f4918cae0835a9b9617b7/27904815086.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/80043277319.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/68553861917.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/46152049644.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/segoxuxozexilenegonobunon.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/zemegodigojilusoxaf.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/85d1b3b709852f2c9e4ad36b332c5853/mizalusedoberi.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1627934707741097593.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/a7d9e8f7c4c8afb63f2375190c31aef7/73719800989.pdfIn PDF document text
    • https://tsegypt.com/file/59553133922.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/lowebobinuwifiwesuv.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/70168260657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=top+notch+fundamentals+pdf+bPDF 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_off0000c02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83C 20976 bytes
SHA-256: ea044eed5a46c2dd4ece4c4f17e0a1e431f85004e0530e1565406900f49d98bb
font_02_sfnt_off00010f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F37 10896 bytes
SHA-256: 5cb6677a1428ca56df08995600af624846068c47056e13ab1ccf14a003c1294b

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