Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d50bc753183fac…

MALICIOUS

PDF

93.7 KB Created: 2021-08-26 17:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b7f0b1ba8fb15f27393e88372839bd5 SHA-1: 33313731af580a947aff71ef32ba1e3b657b2670 SHA-256: 78d50bc753183fac702dfc3ae0927ee209bbf347e4b0da4ecd31dba10d764902
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score further support its malicious nature. The embedded URLs likely serve as lures to download further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://laborke.ru/uplcv?utm_term=2+year+experience+resume+format+doc
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6859acfbe4---kidubimafuligata.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/8f6964d622ac76e156956fd9c11bb379/vovebod.pdf
    • https://prtl.pl/userfiles/file/foxezifevojonano.pdf
    • http://blesk-stroy.ru/userfiles/files/14065798652.pdf
    • http://mhinflatable.com/upload/file/gakomi.pdf
    • http://driver-jazda.pl/upload/file/xufojobipuvifajusuxuxe.pdf
    • https://daotaolaixesontay.com/uploads/file/topukuramiseleguxagemozej.pdf
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/11459779535.pdf
    • http://alumcity.ru/userfiles/file/89686039267.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/kantcjsa326ecs5ufneb28ke4q/42169675223.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160881da7276f5---munagupozazevuzuzorixo.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/cdf20e07369c55c19f74b7769df9efe7/59388124098.pdf
    • http://bannails.com/fckeditor_userfiles/file/kavolog.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16082309142d71---wuxuwivixuxiz.pdf
    • https://airflow-skateboards.com/userfiles/files/nafuja.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/25fba7ea03481835288d5cbdd4513b88/68900658968.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/hiktsfmivntdibolpreamm99ok/39746152410.pdf
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c9b969919---satipikolupevuseleb.pdf
    • https://bearings.vn/images/ckeditor/files/21549408299.pdf
    • http://syuncyoku.jp/upload/file/58736484540.pdf
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pefuxeropotibobiwulix.pdf
    • https://argekaucuk.com/nbg/upload/files/xadus.pdf
    • https://legouic-peinture.fr/userfiles/file/jebikap.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160d383ab159dd---wegezipe.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1a169e7e6---96373827035.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f44e.bin
a849a42113f21161ea7e953e04d88c8b4cdc8a7161c2d2d6b3187391ba76a740
pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 11072 bytes
font_01_sfnt_off00010e34.bin
f3ac821de291c70573e81be2a4b39c5379d3881bb390c22af09771c37d47cbea
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E34 17184 bytes
font_02_sfnt_off00013ae0.bin
fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE0 16144 bytes
font_03_sfnt_off0001505f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1505F 16792 bytes