Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b781a7fd4e0de9…

MALICIOUS

PDF

88.1 KB Created: 2021-07-03 23:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f398605e065e29e7bc12065e3e9a3342 SHA-1: 3f5cb099c09057349fae00d5a1827cacb3b704bc SHA-256: f0b781a7fd4e0de978e550c65a836989f9b54713ff3618197a8f8d2003a8bf18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing campaigns. No scripts were extracted, but the link farm structure is a common tactic for directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=can+you+eat+steak+2+days+after+use+by+date PDF link annotation
    • https://mimpishio2bet.net/contents//files/78192052798.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/4nbfjit9dvg1ub8ft4vt32orkv/52473026228.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/pozisitofasigiri.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/slfcd9gaja9vru7ru8s0hbrpq6/midisokimezowixofa.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/57149504366.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/2abb5b22a6ecd5ab1e5b89a2b55caf7d/sekedabusu.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/38953245373.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/m08pqsclkmfhahkb8lfkl76vha/61112328104.pdfIn PDF document text
    • https://samowar.ch/upload/file/xozumiborofuguvipemiganup.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/65079006595.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/f72a66a2ecc481ac4adee682f670a98c/voliruk.pdfIn PDF document text
    • http://sciattella.net/images/file/venozenozugikirifopulus.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/8vpr9nfsh832hnofvloep09lja/24280158645.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/9450595cc6fee135e805ae5a0c7dc3f1/jikepuzofiriribolotinan.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/10122447987.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607595150082a---69835159347.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/kixubukutapen.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/47872565782.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/48113735035.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/5vst4pb0k9e3npm8o4l8tlcanb/1977317484.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b36d3f106d---rinoxudevukuwidolof.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/08056d04172d5bcd05f358b1d1460a7c/91521518251.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ab27153faad---jefusederugijezozep.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/0a800188410ed4295d09a152fcaf1fcd/rorupupumevepoxovix.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/0f8d598c631e5e4e1a785cce43cdf1eb/jifuveb.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609114c271bb6---befenosomolagawidipejo.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_off0000f424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF424 17332 bytes
SHA-256: acfdb222429e52596c714f0209d315367774d1ccf322a35cf8a0601032b4276b
font_01_sfnt_off0001216b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216B 10804 bytes
SHA-256: 784897e08b3240c1b91a633c5f7d772facb8fbc1a3982b39557cdb350d9e4c12
font_02_sfnt_off00013aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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