Malicious PDF — malware analysis report

Static analysis result for SHA-256 b35a9655b8764aa6…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 22:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 032b5103c8193607126e7f94106aeeca SHA-1: cb598e1aa8105cacdde7839a12b87d5405a88f11 SHA-256: b35a9655b8764aa62bb624a8770f8eb4812e2f0dd543037fe84b5e635d484481
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The document's structure and the nature of the URLs suggest it is part of a phishing campaign, likely delivered as a spearphishing attachment.

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://takitech.hu/userfiles/file/gepejo.pdf In PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/kuduxed.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56873066580.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c54e219d3---gojetaf.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/bazoxojipisuxamukim.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/zilujodam.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/5b4397ab84b8f30e342f96baffd127b7/repakimefo.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210721170048830407h7gy3i.pdfIn PDF document text
    • http://jfkanacon.org/data/userfiles/files/73019312545.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2baa3b4d0a---31174791733.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160884f725c322---sivaveko.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/45668729383.pdfIn PDF document text
    • http://garderoba.sk/images/_file/towidudewe.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6c7f7840310c645961f2acf51ae31f76/48226808723.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/vomamenediridivumowubeset.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca13f8779a---dikebubajamulepoxaxupeva.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/xezifivazonulovuxime.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/42074521409.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16093f8e68bc34---jazurujul.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b574e6238c6---92843256735.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/88437868358.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/234ce335fd505e3aebdf2f119becf111/sopanivimafaxon.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/zaputekipajuwowiba.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/20996119371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=baby+shower+emoji+pictionary+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_off0000ddc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC6 11360 bytes
SHA-256: 685c50f9a50647bca2e1493ba8e5e1f05d8147054a1125e5200954488bf7b3c5
font_01_sfnt_off0000f841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11053 16800 bytes
SHA-256: 1d6a1c55c2e1f5417901b4ce5f94b29380d5a198abae625c72ff8571d74cece4

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