Malicious PDF — malware analysis report

Static analysis result for SHA-256 d59031a8ba4e90db…

MALICIOUS

PDF

88.1 KB Created: 2021-07-05 23:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8c2bdcde21eec177036a4bee1122723 SHA-1: 4c62f4aff26da86c9abc8d2b5a97df24103d5fac SHA-256: d59031a8ba4e90db066a52458d94d208a8fff4aa10889892b8a44b9f46397efe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

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 https://nomylo.ru/uplcv?utm_term=cuyahoga+county+recorder
    • https://cakenepal.com/userfiles/file/bofapezadovawed.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd91e0bb9b2---zidovasanifuzoruk.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160da9b9b1144a---tawutixafunasunitibabal.pdf
    • http://kmkonsult.cz/userfiles/file/63782000866.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a403aa036---57158448825.pdf
    • http://alarcon-v.com/editor_upload_image/file/sotukoli.pdf
    • http://erbamedica.org/userfiles/files/71921512937.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/23e2cfa1f79c08ed687380b31b406b46/lojujasekujaved.pdf
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/15913389578.pdf
    • http://thongthien.vn/upload/files/suvikipuvajuwiwemaliji.pdf
    • https://binarbaidequipment.com/public_html/userfiles/file/2811532441.pdf
    • http://usarsenal.it/userfiles/files/8042615289.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ccdea8f3779---91267362866.pdf
    • http://jrpst.pl/userfiles/file/gatijuj.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/e4a7674d0de17e3ba7bf96bd92aa5607/duwikajotib.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b44ace210c---50836141258.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609448b0a5f19---26018992681.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/ad9a91f8dc86e5da36864877a66e44a4/93081602581.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92cb65abb0---pitisuwa.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/54422247fe516de7c35b7a31141cdaa3/42095480511.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/87f0659a759ce853ebf3a5cb0543eb54/42532556662.pdf
    • https://t2sc.me/userfiles/wexenosekiduwe.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4395449b7---terumub.pdf
    • http://tfh-filter.hu/_user/file/zibenunazaj.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-6-15/20210615045222661853.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/3187b1370a3228e877b67f3efc284f27/xubekolasowug.pdf
    • 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_off0000f977.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF977 16792 bytes
font_01_sfnt_off0001118e.bin
7bac7fdd586ecff0693dbc93a6360fb9ef905efec0d8e0a00521c7781595e175
pdf-font-stream PDF embedded font (sfnt) at offset 0x1118E 10588 bytes
font_02_sfnt_off00012987.bin
1c79ea70b7d14eed521f4276c6033e8e606cbc9cdd16c0a24130bc025d8b4e3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12987 16176 bytes