Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af1e7543d8c0c7c…

MALICIOUS

PDF

89.2 KB Created: 2021-09-17 09:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 155bef3e3311c46cc8b87f30bc68caac SHA-1: 61684a1f42e68e644ff07681f29d4a93d2e32f99 SHA-256: 0af1e7543d8c0c7ca4796c2ade3eea79234347fc43d05bad33ee96d255f99ddc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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://dblbtech.com/userfiles/file/43868561185.pdf In PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d6378f31a---92469560917.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/17606635364.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/tadukenukofibupepukav.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/muzurazanunomuluvogutova.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/vikelato.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/darafi.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/raluwenetobuxifudid.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/tekixowosakivefuguzebiw.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/vufiguwutomojug.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/79624553527.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/wivamutugavekupebokof.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/baninukiru.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b850771bbe55a3d495ed981aa3098829/78870113855.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/semegu.pdfIn PDF document text
    • https://riwg.in/userfiles/file/sewadumedosixoduru.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/mimuxulawubidofav.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/fabuzuludijazozafexa.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9638054b8---masenakedibeb.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/migazolixoduvikatefedip.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/86985640235.pdfIn PDF document text
    • http://kezheng.net/Upload/file/sadajulelijodi.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fc66a8ae9---robixividuvamupeg.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/wazojuwux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=speedtest+online+androidPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000106f9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x106F9 16244 bytes
SHA-256: 9229bde5e3614c940ebb387a6affb910e6b09cdb82f6b0ab59768fbd23138caf
font_00_sfnt_off0000c805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC805 25768 bytes
SHA-256: abfcd4633f1fa1c9649637c9a4e829aae6747f0ef096cb7b5c048753173272e4
font_02_sfnt_off00011ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000134f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F6 2068 bytes
SHA-256: 3d0d8a1729b48bdf7b69ec993b9cdc406dc1948ff6db04ffbf2747bea0320864
font_04_sfnt_off00013e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E74 10460 bytes
SHA-256: b1cf3e1b6318c01e549c488b5d4bf4cf44e28d1cec55066dccafc716b24b6345