Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68b59578e1d3e3e…

MALICIOUS

PDF

92.1 KB Created: 2021-07-04 16:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24344eaf10d9f4cc9de0f48392ba3e87 SHA-1: 87d5614f3bb760b1e51c6bc86b5993399b8f486f SHA-256: f68b59578e1d3e3ebfbbbc8c3ca0052d293a6af0b342113726094cfe8cd5ad93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it likely contains malicious content or exploits. The heuristics reveal it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress upload directories. The primary purpose seems to be SEO manipulation or hosting of further malicious content, rather than direct user interaction within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://delshadian.com/public/userfiles/file/baxavebitomegolakorasat.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cedf433a69---janakebutavuwanudida.pdf
    • http://www.siposferenc.hu/html/74068282619.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e0eb8944c89---3539550718.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/qgrlnr9khon8p8o3sfjkv1feob/26771481415.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/83ccf68b75329ec23198be76e778665a/78776207171.pdf
    • http://hitecds.com/userfiles/file/xarofelalonuxutofimubozew.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160989a5e013ec---7437937935.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160941df6789f3---jipedulikupuxerawes.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c8e07a65---22114927626.pdf
    • http://freeski.hu/freeski/file/fovimadigib.pdf
    • http://asianmosaicnyc.com/userfiles/file/biripixadomem.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083761fbe947---mezibarurisilebi.pdf
    • http://altinay-law.com/images/file/rakosuvoxine.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dafb6123351---64183292129.pdf
    • http://lafayetteconnections.com/clients/52818/File/6170265890.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/6815bc5f359d5d05dc89e6484cef5bc6/76576815729.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4cd4903ef---85784493428.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbeab68e17---rokiwe.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/e165e156d301fff8fbb80f149be5ef7a/40808494164.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9124b590f2---bamoxixifa.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe3482cd45---99893469497.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082e7f6e9164---40398820996.pdf
    • https://lapakunited.com/contents//files/vadapi.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fcfd47e2b---24982949207.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/5d2478fa8b5da02db4033ef79862b44a/13271259696.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pretty+little+liars+book+author
    • 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_off00010236.bin
a37591008033334d7013b24b935cf2cd1d519f0bd22e5174ae56d6a5a60e6047
pdf-font-stream PDF embedded font (sfnt) at offset 0x10236 18360 bytes
font_01_sfnt_off00013297.bin
f0cbf10f731576159332d7a22b4a701162f2f16671e32ddc668d05623bffe9d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x13297 10548 bytes
font_02_sfnt_off00014ad3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD3 16792 bytes