Malicious PDF — malware analysis report

Static analysis result for SHA-256 8705734ba53033f4…

MALICIOUS

PDF

80.1 KB Created: 2021-09-06 13:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4fc94c9c594a9f2f793f43f898b2e3f3 SHA-1: d8ff36ddb3b9ff6e762c8c3430620510090b30c3 SHA-256: 8705734ba53033f41a34c313dccdd54c0026ee20581a65905f74861230108793
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm pointing to numerous URLs hosted on compromised WordPress sites and disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and link farm patterns indicates a likely initial access vector via spearphishing attachment, leading to exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cructi.ru/uplcv?utm_term=ccna+networking+pdf+download PDF link annotation
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075389db71af---rorujozuxepikagelefe.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/budadikas.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/89309283722.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021082800565888.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f40e7c2fa---xopijugivubil.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/tenilosibitusubevelax.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/rizapu.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcdb3f176e---wunamusabuguxupimabuto.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/24179515d2a3a88126b414773e7929df/zugitidijujidupekuwezo.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/bapenutadat.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/rovasesobovewiwagodip.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/5534990780.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aed11e23cdd---pinezewowut.pdfIn PDF document text
    • http://airsoft1.ro/files/file/gimabarenixavor.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160776e3878e1e---detitelemi.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/vufuninanajixik.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d5a20fc8e---pakerulojuzubodo.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/77778128457.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb55888d9ef---pujuxadasafewojuwame.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/wufuju.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/bbea131f42edb89827fdde3d6de7727f/34282114802.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/feveguzatovenanevesajel.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CE 17648 bytes
SHA-256: 2d5e93f4bf0bd66df47b17bac882ac022687e9be30c46c072964460e7a29cfcb
font_01_sfnt_off0001024f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024F 10836 bytes
SHA-256: abf99a0596cf03313a52ff828f36ea0285d3e0fd0b565750c71fb6c68fb16228
font_02_sfnt_off00011b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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