Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83ae7818ba7cf5c…

MALICIOUS

PDF

79.9 KB Created: 2021-07-01 01:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 081d42cf9c6895bf60a1bf2ca6410700 SHA-1: 7724f9a087deb55bec0a3d5f4967762aed164a4d SHA-256: b83ae7818ba7cf5c3b1bbd87623fa7489a9f0f7b7d48d21e06ce25607cb0dff2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards an attempt to redirect the user to a malicious site, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://parkhigh65.com/clients/4970/File/45954743436.pdf
    • http://abc-tel.ru/data/File/dufador.pdf
    • http://adamlegal.com/userfiles/file/70592529658.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/1cb6d9924bc9f4aa7c7e3947dea6b3a9/56873371464.pdf
    • http://safeabortionnepal.com/userfiles/file/65375408537.pdf
    • https://atamergranit.com/userfiles/file/67507857150.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/mlbgs524ep7hp0gpkkejcu80f7/38262348266.pdf
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/zususoripajokusi.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608029b6bbe57---pukobikipawiguxekija.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083381a91b16---kesabalunixibujetidave.pdf
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/87399333603.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9878188ab---dorozejum.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16079c33d2994e---58601893867.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/cujp6nge03gt6fqii5i5nfah50/mujuten.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0d9d4060a---jobogatude.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086b248d6363---rugar.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/299e0b44632466c0ce936b76ed8bf3fe/69890670155.pdf
    • https://daiichitravel.com/uploads/news_file/vinazorowozupulime.pdf
    • http://poiskvod.ru/images/file/90485798408.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c7f46090c---kobadinowo.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/eedf9b6be89cf2b721606c7b7a5ba2be/50999091202.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/1kb7c7lqnlol9bdut742ovdqhm/39111625846.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16072b404f20eb---zizelifafazowijabut.pdf
    • http://absolutelyneon.com/userfiles/file/xebojorurojerigukid.pdf
    • http://kiavysocina.cz/UserFiles/File/39806810651.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=out+of+his+hands
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d67f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD67F 16792 bytes
font_01_sfnt_off0000ee91.bin
b9f80cb805e37d2e7a5ef7afe2b58866d3e81b668427cbddf9c8659f2bc0dfac
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE91 17152 bytes
font_02_sfnt_off00011b87.bin
2ff64ac447850bf6eeb969b2ba1874afe1fa4d6ec9b9e5c9496b0e957523fc4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B87 10296 bytes