Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f7300c2265eadc…

MALICIOUS

PDF

81.4 KB Created: 2021-09-07 18:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 33575a85ae8e36a3df60d8fd617bfd02 SHA-1: 45bded81397b9d7014b5cd3ff6d82f461d4a5d75 SHA-256: 42f7300c2265eadc2d41fc9b915dbd87870ce13702984e42d7da38732241cb3a
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, but the presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a pattern of directing users to potentially malicious or compromised web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086681778883---wunix.pdf In PDF document text
    • https://mongolia-volkslift.com/uploads/files/feravavozexa.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/97572282451.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4559aef563---jibidixokaxo.pdfIn PDF document text
    • http://greenreunion.org/clients/f/fd/fd69eab1634eeea6368acebbe5d5cb0d/File/87717777939.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/97513a1cb62bf57ca7c976b94e7d151a/sabumijenegiruwuso.pdfIn PDF document text
    • http://aps-mes.com/files/file/61355880514.pdfIn PDF document text
    • https://securityguardsupply.net/php/uploads/file/28606803324.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609448819ac0a---tanodadebetukagorezen.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/fobekulogoto.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3eb85ea774---49676717328.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/99732520305.pdfIn PDF document text
    • https://shidoremicrosys.com/media/40185989537.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/b3f35cb293e553ea12700c200921fc08/zoriboxizukupifivubajekuj.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75220554248.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/47645590009.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/72906114196.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/62091967307.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/simujogegonipuvagunizule.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/lidimufoxoxuminezefupu.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/e881c0e3dc183a69cc6d8cc9c744270d/matumibadapimufoniloma.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/8b601495faad107dd1656696b3ec6ae4/87466034330.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210508050233144558687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=linear+equations+worksheets+grade+9PDF 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_off0000d64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE63 11028 bytes
SHA-256: b6233e6f4ecc4bd1a9e1873c0cd24f6e7d92b438948b2417060ea44dfbb9b1db
font_02_sfnt_off00010793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10793 18336 bytes
SHA-256: 22ef51e9cb238901cf709080bc20bc7fccb30bef4ee3a1f92906473dacb1af13

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