Malicious PDF — malware analysis report

Static analysis result for SHA-256 139e93071fa90978…

MALICIOUS

PDF

97.5 KB Created: 2021-08-21 12:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: abc78a3161a327721198ce5c54c23b80 SHA-1: 9b559c0e45e1d56710994d740ef517aff06ac1a1 SHA-256: 139e93071fa909787fd4d92cfefa9416d84fa12d9fd782cac4284af2357cfb52
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 0.9881

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://crewmak.ru/uplcv?utm_term=pr%C3%A9sentation+plan+d%27action+commercial+ppt PDF link annotation
    • http://www.sport-konyv.hu/userfiles/file/zosufegekoxawowokulapa.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/90506892058.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/6114d4c10c35d317a3cc93b420d157fe/dupijifukopamisi.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/35537890954.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/70a5156c98555d1eaf400bdcb76220be/dozenuvino.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adfa696f65---1741415377.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/joxiridupaselivunir.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/73884819568.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/3b6tp84o7to4gi032m8eu1fij3/gegup.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/781179ea004807d408efcfe3301cb497/junumuv.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/vamafopasuwo.pdfIn PDF document text
    • http://cichanski.com/Upload/file/mizegalori.pdfIn PDF document text
    • http://surtek.biz/image/files/20150115_054033.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210806215758.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/66250368371.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021051407011073499.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/2af112a238586c546ad6ecfd1a6481c3/viwolafobika.pdfIn PDF document text
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/94712698509.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/27219846931.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/basakapokubep.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/vorekagorugifit.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/20767064994.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C0 22388 bytes
SHA-256: 5438f8b7729cf23bf870aa98741831372ae93a802544f9bc88f72dc1314322be
font_01_sfnt_off000123c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD2 16648 bytes
SHA-256: b5ce89f740b415a5a843f6bf28c7c0648927b3e2716c65b66f5a305e8d3524ca
font_03_sfnt_off00015372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15372 2040 bytes
SHA-256: e1b61e7047ef3e5c8fd2f0458d33b09b24b38cd072f2049af5ef203b1b4f7ac9
font_04_sfnt_off00015cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CB3 10864 bytes
SHA-256: 2b22239bec5be6945bd0496b453f5edf010282af771b3a72bee133ae35b5be00

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