Malicious PDF — malware analysis report

Static analysis result for SHA-256 58580526a659e7ac…

MALICIOUS

PDF

86.0 KB Created: 2021-07-31 19:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c29906d02d958c851da3a7f899d0a439 SHA-1: 7b4b298cf6145d1e1e05b733a6576a49c73accc8 SHA-256: 58580526a659e7ac9e86723669545443dbc48fa449396e5d6887453c7e6bdc54
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious destinations. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://krisoc.ru/uplcv?utm_term=cat+goes+fishing+free+download+for+pc PDF link annotation
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/42076239401.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e1c26f1465b5baf437cfedc817db5337/5646085999.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/regakazobi.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/0h1othppvkill91s0r8s23caer/walunonebaxomeletobabek.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/9895426803.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/84344d252049a8689d2921add6e39663/wofutuse.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f77debf88f---18635465960.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/3487bce1d646f7f8a8ff8a569d8809bf/gureripijijosakovub.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/punubenidexixap.pdfIn PDF document text
    • http://ellev.fr/upload/files/45742755302.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/xafaxovew.pdfIn PDF document text
    • http://atomleasing.ru/media/File/85098026901.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/31090631770.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/11402873945.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/s6viag2tqh77nhq212sodthak0/90743464850.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0739d24c52---36588426172.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/7757695996.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16082af8a0109c---91102821694.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/8635752842.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d962fb0ee52---23059420291.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608249d90904f---77001135482.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/82880585991.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_off0000eaea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10301 11016 bytes
SHA-256: 56f33551dc645107b252ef076c9e914ed31fb4fd25feeb7ac763d4f10af64651
font_02_sfnt_off00011c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6E 17220 bytes
SHA-256: acd03c065558a0f05ecdcf471f04ac81d07c9e345e1acf45a8a515c0618dd07c