Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15d67b6cc1a4858…

MALICIOUS

PDF

82.8 KB Created: 2021-08-31 19:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 19ce88218c7b9d67b8c4529538050d80 SHA-1: ace98ee6f29211c736d5082abc24fa3ac2aa4897 SHA-256: f15d67b6cc1a48586cd52d3c9ea802d3f2399f554ea7d39361ad970ca3ba99aa
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, several of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to serve further malicious content. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://sealskinz.ru/files/file/77062404115.pdf In PDF document text
    • http://reicar.dk/userfiles/file/losomabafazabofeg.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/de67487287e0a73490e6a0b70ccb6490/58375419885.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/71306933897.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160985572a519f---67007491766.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86585941ba---56781994697.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/93097602929.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/49667581722.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/nutipibedukona.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/36985660103.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd9d236160---28222529616.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/75752924728.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/167247360.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/80129620864.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/34992852149.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/46989999095.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/zazixusedonebazuxagawote.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/22018009875.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2c1b25e7f---vibotut.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/f1bab2e72d8d69f900d38ec8c14a9cb1/pogogefoboxawazamavapukep.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16111b82171ae5---gitoxazuzaxifivipo.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607195d43acdd---93143607821.pdfIn PDF document text
    • http://absigorta.come/file/leron.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+wash+a+teddy+bear+by+handPDF 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_off0000ddda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDA 10536 bytes
SHA-256: 5dcd97463dbcb00643ffa9501eeb83b8d4e7d8679ac04da20b85ec065b45e55a
font_01_sfnt_off0000f5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DA 17812 bytes
SHA-256: 366c4190cf2ff0c4696f7d0e0285f9cacff90bd2f1d02f9c4aba4e7ed3f986fb
font_02_sfnt_off0001245d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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