Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a0dd61d805981a…

MALICIOUS

PDF

83.9 KB Created: 2021-09-16 02:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9139a7b7c1d70c2d05645c6fb62b779f SHA-1: c85d416cea0400b7453bad00731fbb90de11dcc3 SHA-256: 82a0dd61d805981a45ab6a40dab22f620cb7e202ea196b9fa0e3f0f81d73a71c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=ereader+app+android PDF link annotation
    • http://girlstown.org/files/js/ckfinder/userfiles/files/51420045003.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/66633696046.pdfIn PDF document text
    • https://inarsindbari.org/uploads/94195736657.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/retosezaw.pdfIn PDF document text
    • https://fultoys.com/userfiles/71435562703.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/lekididedufoxenimi.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/juwopapixufugetibugadu.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/lbc03q0s6l5l60444bq6ru4f2k/80884495094.pdfIn PDF document text
    • http://raczcsalad.hu/files/36311315073.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/99997993652.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/8567455207.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/tefuji.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/43527926815.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613760d1d26b0---48039214190.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/vutolik.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b04f68f1cd---34327961805.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/51079533481.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210903155021067407cmrpho.pdfIn PDF document text
    • https://salonrewards.ca/images/file/gagirisex.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614283798d882---kewag.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/vedoforudisuse.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161408f4bc004d---vumiv.pdfIn PDF document text
    • https://kar360.com/resimler/files/doresesosoregomite.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/wasijitojepesowepiwesivo.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_off0000e693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE693 17312 bytes
SHA-256: 92f67a48750475eea5557c0748efb2491bfb3af8785766e1105e52226c46e04f
font_01_sfnt_off00011381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11381 10056 bytes
SHA-256: 1bdc38add5c4f1cda5f09a85a2efbc0f3aa721f8ddbeb812282a06523e57daf2
font_02_sfnt_off000129d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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