Malicious PDF — malware analysis report

Static analysis result for SHA-256 7636159e956df445…

MALICIOUS

PDF

84.8 KB Created: 2021-09-05 08:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 62db92ffdd3e99088befdcb327c6afbb SHA-1: 09f81efd7031f62fafc99b34678295342dbdec41 SHA-256: 7636159e956df445364dc5d800a802d906edf6383a06e63442726c605a6c9efc
156 Risk Score

Malware Insights

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

The PDF contains a link farm heuristic, indicating it directs users to multiple external websites. Several of these URLs point to compromised CMS uploads and disposable hosting, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.kroonzuivel.nl/ckfinder/userfiles/files/lubujidenovakev.pdf In PDF document text
    • https://asthasupermarket.com/userfiles/file/gotedaxuropeganiwefalum.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c842735e87---8979376790.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607bba0d83d0f---kunivi.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/tazukexidazedogetigekoz.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/kililebinuzisexegen.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210624142705.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611492bd9a85a---88628954487.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/majilalusilukize.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/17252862944.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/nusupixokodemudin.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/feturepogedewu.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/c213lufosvfhufqtmqov5frai6/89679173867.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/gebowamar.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610577b204dd8---41097570659.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/26922417125.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084e7e113168---76597554932.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/7184428776.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/robopugujesepoxibumiji.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/26155949680.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/soguzezedavitekaraba.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e324f7a113d---zuledafuwobosazo.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/60303261774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=sigmaplot+14+user+manualPDF 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_off0000e5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D0 10900 bytes
SHA-256: 800d0ed3dd0add4914a49cfc6a377d3570910d78dce1edd489925fd6769b704c
font_01_sfnt_off0000ff16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF16 17992 bytes
SHA-256: 551138d805e5da536f6d03b046216a7a079e46c85e5de608031ce0143a7a117d
font_02_sfnt_off00012e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1