Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d48b986b346672…

MALICIOUS

PDF

77.1 KB Created: 2021-09-17 16:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 12c2e2f640720d6546159b80b1ca1e30 SHA-1: 3df024e513671207faf06f266b5fec8b1e2a6cd9 SHA-256: b7d48b986b346672321741bd53f917e83371f877848315b8cc69fbb5bee9c09a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to various domains, including those hosted on compromised WordPress sites. The presence of numerous links and the 'utm_term' parameter in one URL suggest an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=how+to+respond+to+a+group+text+on+android PDF link annotation
    • http://chemicalengineers.ie/images/91640115003.pdfIn PDF document text
    • https://arendic.cl/files/67800831215.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/xoxirefol.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/tudigup.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/pagufiwezonoxebex.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/76814369855.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/77917949480.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/tufulonizekupo.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebbc204666---49006720206.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161327d3cc0203---97941145879.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/72900955877.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/futudaluw.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae344bd702---19316231706.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/84949711043.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/45230679604.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/48189717461.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/gewowunojiworowupevu.pdfIn PDF document text
    • http://myesen.life/userfiles/file/pufurejusonufitowi.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/a1g18v4sa93tfrjld3dgj1t2nb/pekazololofuwa.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/23852280254.pdfIn PDF document text
    • http://korytnica.net/data/files/56610904384.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/vijinatome.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/bokedetotapadejev.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/zuvulumobefujegupijize.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_off0000c706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC706 17892 bytes
SHA-256: 194621601c6b409f080385ec6f611115f01e42118e531bbf85ddef419711c4d5
font_01_sfnt_off0000f549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF549 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D60 10800 bytes
SHA-256: 0697af2b9915c2169f62560da6f69ba2e7ba2dccf23481c57cef69605a52cff2

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