Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad5320001d55678f…

MALICIOUS

PDF

73.3 KB Created: 2021-09-19 06:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2b1e60f8ad5585cfa7495118d1b79fac SHA-1: b1442a411161e54493b19a6f0ae6c3ed0144db3c SHA-256: ad5320001d55678f0b9a6b772bdf90b2881dcd658243106aedf43f20ea35a013
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, with the file being identified as a phishing trojan.

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 http://gotween.com/userfiles/file///82685601463.pdf In PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/43208603162.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/zosekukelurukuneb.pdfIn PDF document text
    • https://ccskin.com/geektic/files/xenilobekoleg.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/42729709921.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/xefogo.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/xobun.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8f7ec0f6c---mivunusegiburene.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/pidov.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/rojisajijenox.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/kapoxunopusoxafirikew.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/53336691552.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/63052244983.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f34b030da---31910995961.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/guzedobi.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/46372223167.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/565a7692e4ca277e65051935b54576f3/47956471105.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210910205419.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/74056305548.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/razexemu.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/nigejixojujexow.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/f44ac6c52b22595235f0367705da14d9/forijuvukonavokopidonidif.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/22902459836.pdfIn PDF document text
    • https://defi128.com/userfiles/files/jesafewuratevapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=efootball+pes+2020+obbPDF 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_off0000bc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC13 16988 bytes
SHA-256: cac23ae8298f9866e029da9bdb5ccfcba3c1cd57f396427468b4d0a62dc7a8e4
font_01_sfnt_off0000e82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82B 10420 bytes
SHA-256: 5a6e1645c09656e74e4c522c60c409bbf6b1b395137eeb64d99c267e6f5d58e8
font_02_sfnt_off0000ffc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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