Malicious PDF — malware analysis report

Static analysis result for SHA-256 2698de37bc72126e…

MALICIOUS

PDF

87.7 KB Created: 2021-09-15 21:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dff44e96c710579c36a9db70d1917d40 SHA-1: 05dfab7586753b13daf7c9e2c8a8c58f9ff5180d SHA-256: 2698de37bc72126e20f17acfc469192057c33312b1f0bfc822743a7b7b1f1f20
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ketchas.ru/uplcv?utm_term=what+do+u+mean+by+nfc+in+mobile PDF link annotation
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8ed568a8d---45411140052.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/vasekimoke.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/94499182554.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/38805180415.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/kegaximemo.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/84879586469.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/gobirupanale.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/bepoxizuvajibegutopete.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/49809511654.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/pagemawedan.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/movamon.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/43307265326.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/djel0o38ubapb6rnvl3f9pp711/kibemudinimasazuzijusasek.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e46c82d44e---mafamutuzinagusarumoritiw.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/27558838757.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131882751afa---xideporesosavitefebixe.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/rajunavivegexa.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/zajiw.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/45938025158.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/10977365792.pdfIn PDF document text
    • http://montazenabytkupraha.cz/files/file/gujijadirefotajo.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/87078988649.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373c9210fad---27270772938.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/58571d5088c1d6f13ab072fb4a6da21f/7151671942.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_off0000edd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD3 19172 bytes
SHA-256: 67a3cc953013dc43a00837ea21163790418792f4cc19f30beaf0494e6593ec22
font_01_sfnt_off00012023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001383a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383A 10820 bytes
SHA-256: 690567967a7920d71b6668c385cb064ad37068b5ac41ad94b63425931f0ca1b5

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