Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a3a9968edcc65a8…

MALICIOUS

PDF

77.8 KB Created: 2021-09-01 21:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3190a9150d8e5ffc3153c7bbb95faac3 SHA-1: 152efe974641bb8b202c1efa51a029e103a6dc89 SHA-256: 9a3a9968edcc65a8dc27db17fcf8f6c29151a6c5b1812e44631b03f64001d726
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d47586ae366---fonoporigenumapiguvil.pdf In PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/8c9bc6a8b2998e45c4b4bd4f368c0ba9/nitexuwevudikepuxalowasi.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/jidomexovinib.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4393357f7a---21350208677.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/99029283140.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f49d883b60---zipudekilomirewomadopob.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/580f1befb39184c9a31a4223ce4ece51/niwenijuwejomafag.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/56256187fd990328c8a89b222f59dc21/vupedufonot.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/1957c9d366830871e667083315e677b5/jokuwitosunagem.pdfIn PDF document text
    • http://macphersonproperties.com/clients/876251/File/85970828325.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/836107f83ac8c727cd2172e3ccacecbd/kewex.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3cb02696357a312e782dc3bc94b281a1/fofogetizugosibenikob.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f939ba6831---nejojumapomuzam.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c323be9f626---30901764998.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/43225494398.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/87098868409.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/96716618692.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc2a38eefc---lumazagalerogofe.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4feaaae67---96770460098.pdfPDF link annotation
    • http://aarogyamedico.com/userfiles/file/64204035656.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/wuxodowesusaz.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/vijaxizelola.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/11788291557.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/vilul.pdfIn PDF document text
    • http://fotossc.pl/_files/file/fobol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+real+story+of+johnny+appleseedPDF 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_off0000ca99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA99 17084 bytes
SHA-256: 50db6f5f30ec01c0f9d397503ddd82af3aad3b45ff53d356feb4a2895b4f7df3
font_01_sfnt_off0000f64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64E 10708 bytes
SHA-256: 136505353dcfa101bb4ea5c93f792afc92c1a8a6c05ab65de02e34d50541bf14
font_02_sfnt_off00010eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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