Malicious PDF — malware analysis report

Static analysis result for SHA-256 731e7765b536a7bc…

MALICIOUS

PDF

74.3 KB Created: 2021-06-30 00:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b79bae372cb60f5725ab3fd0ed9eeca5 SHA-1: 1d266bc224d5ceca37306c7ddb586e0b382e9f0d SHA-256: 731e7765b536a7bccd426aadf886e3d612e8dadc18cf4ac8889099e9e865600a
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, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDFs hosted on compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are designed to be non-clustered and potentially disposable, common tactics in phishing or malware distribution campaigns. The primary goal appears to be directing users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/e4fa337f68e43a6b3bb06db791d2acbb/luzijiloripexiv.pdf In PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/hen84k7jakjgk10d5r08quma31/pegedi.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c77b149fa---80358475449.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d022f00e3f---fivuseverixifokevabek.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cda42f22d---soxokanutevavi.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/0ha82quuomc7alqu3bbcpjobb7/pizasaloraworilowimegama.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/19966531836.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/74018427281.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6875f2c1a---61961923136.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/pemusasojedumuzebosisale.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/779dc14a7057d189f337a04cc0d87e7c/62936218285.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/8nl4eg2pmthpb0eep8bl4e1gi8/17180635444.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/0b70f108098dd439b65d0b3f6e888261/wosozuxuz.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e87fc52903---72877172979.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/72409197462.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/jijulumajotojazopipetu.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/7k52kgc2ctn75f3g8qm6iehoh8/54724218397.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607258ca971a0---27533268317.pdfIn PDF document text
    • http://www.heksan.com.pl/file/fumopakijonopibetukejexuz.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/26965852521.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/08o8qgigk4ftr461adps8s0sh4/26327500272.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/8c7ad267444fdb2e5b9f1e1ba41c4d76/bijoruxunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=black+marquina+marble+texture+seamlessPDF link annotation
    • 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_off0000bee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE5 16776 bytes
SHA-256: bb9073ad2c64d3893c0bc3317320e16c83e5a9b524e59eae1ededdf75ac35673
font_01_sfnt_off0000ea5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10275 10904 bytes
SHA-256: 8373e88e21cb67e060500c6c462bbb2cc8c5c2b48235e8ad5650556963b7e0cb

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