Malicious PDF — malware analysis report

Static analysis result for SHA-256 3137d3dce9d09a35…

MALICIOUS

PDF

83.6 KB Created: 2021-09-07 20:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d1866d67aa55bd07336a848b3834add7 SHA-1: a2b71ce9be4ceb3db46d81c12c67e5d03a7553b9 SHA-256: 3137d3dce9d09a35d8ad26febdff614b1f25663a7b37e21df43f92f55ca67d53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URI and link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://jurad.eu/files/file/vezufotovovaledasibozi.pdf In PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/89644838632.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/58443306196.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16126ec569b4df---boguvixus.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/pimesolulutodimejap.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64f51dd887---kanonojetig.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/xinoravofilax.pdfIn PDF document text
    • https://ludbaegitim.com/calisma2/files/uploads/rifavodetaxe.pdfIn PDF document text
    • http://voijin.com/userfiles/files/xipokelatozuvanoruzuwimen.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/10319832961.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/28520325102.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608be6b4ad623---37979669051.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/15988211463.pdfIn PDF document text
    • http://klpa.net/userData/board/file/87150232571.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/vifarezexanofub.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/41522373149.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/pijur.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/hnkf1dbavq1kongs361kgc949t/48612329151.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608118a302121---8372703695.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4bd49eff9---rololuvoxopugovazeruroduv.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/gireworu.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/tanodovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=tratamiento+de+faringitis+cronica+pdfPDF 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_off0000dc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3F 20080 bytes
SHA-256: bed52373eaeb84387e4cfe5b1bfe9b941744b8cc66c2aac8ab42ec845a0f331f
font_01_sfnt_off00011017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11017 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001282e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282E 10880 bytes
SHA-256: 2fe7d098aa678e7ca4eb220f338de6de9df313f2f4505197a5eeee97c06db495

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