Malicious PDF — malware analysis report

Static analysis result for SHA-256 13999e0da8991258…

MALICIOUS

PDF

75.4 KB Created: 2021-09-07 19:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 10f6ab331c3dc4786e854c2b8af87336 SHA-1: 8ef4d7baa99058c975acf39a0a1d44271c533b46 SHA-256: 13999e0da89912586a688817692a0abe4cadb76acb50f8ed8c6a51296850d252
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phishing lures. The presence of external URIs and link farm heuristics indicates a likely spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/2fb08d108ef126734cb481e71a9756e5/1097631469.pdf In PDF document text
    • http://magendans.com/imagefiles/file/jelijutu.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/rutuwis.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__6110351B82A4C.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/radejatatojiwavujikeba.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bba6563e6b---lidowomisizalotuno.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607781c904db0---14694177231.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0df22732a2ce0332800207ff9c7a56bf/xunisawazilejo.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/478750037.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/4fe11319745c7f590cb39885267d2f12/49849641439.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a944c6e14---mokenujamitukawupogikivo.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/jufazugarijufefumi.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e27fd9623---83912644273.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b444de74a05---gofobodixusavuxes.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/30977908264.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/0m1joergkm1aevr930pr2n791j/35401736352.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e40ac97968c---14273677288.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/69489673499.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/35768577071.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/kozugajegejogomeveloko.pdfIn PDF document text
    • https://ahha.az/userfiles/file/vuxapagegubinibivide.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/muloje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=manual+hubsan+h502s+portuguesPDF 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_off0000c018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC018 17488 bytes
SHA-256: e9aa9cb0b1a4bae47b03066700a28aaca374f16682b8e004e01e7acc935588d8
font_01_sfnt_off0000edff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10616 11048 bytes
SHA-256: 298b81ae223fb537f91f61341348d7d1d22206202b337ce6c8b3cf5659229f0f

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