Malicious PDF — malware analysis report

Static analysis result for SHA-256 026fb4d0720aa459…

MALICIOUS

PDF

90.1 KB Created: 2021-07-31 03:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: d14e8cb733a7de7b6fdf7964df375449 SHA-1: 16279aaa65242465bc368350cc5f2d3e15580d73 SHA-256: 026fb4d0720aa459a44af4e3a3f2894bd530300a1fcba5b0d8df99b9c50dbdb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://leosservices.com/userfiles/file/54181203535.pdf In PDF document text
    • http://aihyang.com/userfiles/file/dufoninepezexofodutod.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/91680250417.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/435457e25f34dfa4a7375c1f195ae342/47778974409.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/farujaguwawig.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/30283924272.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210705054718.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pmoqgl7e92bniutimodlfv5io0/kokupibowej.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802ed329daa---1059102356.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/4581690310.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bc32d6b44---14646846147.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/3c569d003938823ff2dfda588acd59f9/13073571397.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cc82b253f---23463458527.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/56958755552.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/22899855268.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/nedovuvizixitobofif.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/jefurij.pdfIn PDF document text
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/70921853223.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d8ed85a43---relefadugujobelosimomat.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/b57cae9bca379e35412409defde24748/lipusesot.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/gozezozodidanogiw.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160874b205f46b---xinonubekazaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+write+a+undertaking+to+principalPDF 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_off0000fb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB34 17536 bytes
SHA-256: e1e4a2011699744e3c4d9e10c930b81cdb6cb3ef2c0ee533443e1d67d9b86d26
font_01_sfnt_off00012995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12995 10792 bytes
SHA-256: 6a56ea03f5ca3b4b31102592dd9fb7d53e0237b6804c95520b211a9135ea3f19
font_02_sfnt_off00014258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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