Malicious PDF — malware analysis report

Static analysis result for SHA-256 137c09012702f7b7…

MALICIOUS

PDF

83.0 KB Created: 2021-09-15 13:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3c006b9271c8f9a7a67a2d222f48759d SHA-1: 962855e13ff473088bea6303c1ff3de50f3c1016 SHA-256: 137c09012702f7b7cff4e4627a2922c6df03fe4a31b2e55b7155e0a2c504fa44
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://catamma.ru/uplcv?utm_term=tap+titans+hack+apk PDF link annotation
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/rapivowiv.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/97584436750.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/wejilixurivopodejumowemap.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/21499171823.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/wewexunikusev.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/40c24b9de5a5b1105c9ca20ae5c502a4/lumilobutoseba.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/12405741540.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/66929807226.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/83402166646.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/79874752965.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/56849850213.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/wokopaxo.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394d627c026---mivixizenifujuxixepida.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/t1njpaqoad19b95uik6qtlush2/91925374404.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/xitugobikoziba.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc7bb16a84---57161310238.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/tufitojavimexurejile.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29305916553.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/14505251075.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/21105393998.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/12518885263.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/fiderakafenigakekar.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/26468323745.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/nuleta.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_off0000df29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF740 10128 bytes
SHA-256: 067b645aed469c950bdd81f0e03db0c019bb6a1ae029b5e9bec4b103e64d9129
font_02_sfnt_off00010dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD4 18584 bytes
SHA-256: 2d7ba26dba5574ca835871a891e5c2f4faa9b36c98e303f7835cad0fed2837e5

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