Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90a645a9be873e3…

MALICIOUS

PDF

80.3 KB Created: 2021-09-10 18:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ba3bbc02388a9af5c4366224a264505f SHA-1: 4efaf487f1c07af08195010a9bb4289f273b764e SHA-256: f90a645a9be873e3c875e0edfb05db648d73730f1052cc78b6d2e3c2f01ce86b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised WordPress upload storage and other disposable hosting sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://sensitiva.fi/UserFiles/File/58128544796.pdf In PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/730bc24b833bdc03af33901932099061/29055666523.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/sudixegevujofefuwerebu.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/radusit.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/7991041247.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/81912566042.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/kujibanobu.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/rowevowu.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/14374163248.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/rofoxumaf.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/bezixagesiponedek.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30682328080.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/b2c05dec7f48d36240a672f3a0bf9eee/wifutuma.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/12461508053.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613936b09f737---dizefol.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/tutogog.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/jaxog.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/nakujugiwusim.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1630783394851875074.pdfIn PDF document text
    • https://renewone.de/files/kokipanuvupirij.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/73141050662.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/5120880367.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/xivanemogufasum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=dls+2021+unlimited+coinsPDF 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_off0000d58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA1 17584 bytes
SHA-256: 6a7d6c6d951c20245b7ae6ee3df600d5909d1cd51f4ca9d257d2cb88ae08dba5
font_02_sfnt_off00011b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8F 10664 bytes
SHA-256: 49efa794a86745f3d20e3a11e6ed8d92424b3b4f5449488db1fc293f46bd3b9e

Open this report in the interactive analyzer, or submit your own file for analysis.