Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9aaca564ebc5e6…

MALICIOUS

PDF

79.4 KB Created: 2021-09-23 21:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ae26b4dd77cfa7d4b3b718a06f136f89 SHA-1: 6c7a8d83ce99b53e41b21fa44dc3e97ecaba6e07 SHA-256: bd9aaca564ebc5e6abf31889f9ba1bbd2dfe0b85eeeba436162e05a9544ca992
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates tracking or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=bet+tracker+android PDF link annotation
    • http://sun-eko.eu/files/file/rokovezugarakewiveruvekis.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/notibisuwututolumi.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/9170468396.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/74391463808.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16147f945576b5---46442329357.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161315b07077ca---57299415274.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/41320893523.pdfIn PDF document text
    • https://xlquality.com/userfiles/file/2369999110.pdfIn PDF document text
    • http://hrudolf.com/userfiles/79673004013.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/39403294817.pdfIn PDF document text
    • http://goldmustang.ru/files/files/kojolepakanidofigup.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/tewurugapineteva.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c884e3e25---48683374196.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/sakovavidulamezudixatefo.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/23240425590.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/bolibejosuxajojuxemefe.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/liramuvukulup.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/fanojiledumatidagezi.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210902_005426.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e139bc5c013697805e64c129717b5adf/16224256804.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/riparimukemonu.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_off0000d30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB23 10292 bytes
SHA-256: 9f6d877737c94ed43ce04e5a393a924694bbe9861bacf5f055351766e58abecf
font_02_sfnt_off00010272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10272 17836 bytes
SHA-256: 392b328bf881217189bb90a726c968171482d3f1ee8e7fded02f19a5bc4a8dc3