Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e86300b203f0ad…

MALICIOUS

PDF

81.6 KB Created: 2021-09-10 09:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 637fbbafb97ddcb6ec520c4396f4953f SHA-1: df8f8c709ad46f8474ee0f8b585a4a681aa5a020 SHA-256: 11e86300b203f0ad1fcafd9fdc0241a795b35463586a6166f6bfd7fb24147d7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ML classification and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs forming a link farm, with heuristics specifically flagging it as a 'compromised CMS upload link farm' and a 'SEO disposable link farm'. These findings suggest the primary purpose is to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://krisoc.ru/uplcv?utm_term=desktop+in+android PDF link annotation
    • https://lengthening-sldf.com/userfiles/file/mowobuwarap.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/77058772469.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/21285969197.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/mezarugasuzixewizadixoju.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396acead1ad---89852061645.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/78695635895.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/xabuwebuwer.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/lilozogo.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/lefipefiju.pdfIn PDF document text
    • http://manenshop.com/upload/files/raxaboxawivutibet.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/xugililirufokanen.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138607eb064c---dunolupivelutipebotupor.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/22664418669.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/xipelobuzumuku.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/0a6d3b2ada26ab560cb0d975d0983d74/51260541788.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/25874391138.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/xutonijoxikiforiwuxikedot.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/jelesutefesanufojevukel.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/53652352066.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/69729376869.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/dofemosavifuzigaxuzawa.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/pejidarinijuf.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/nesewitutaw.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/7335161312.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/97783210861.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/1bde0c0026bcf5587a110ada6e516245/kikedebowikelop.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 17688 bytes
SHA-256: 6fc99e3613bf017c34cb39cdbe1b95b7d8d6e455adee433c8db4ad8ba737bf02
font_01_sfnt_off0001094b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12162 10432 bytes
SHA-256: c2d1abad14ef2bf205ab9cd19227991cea1b27e7c325c808765c7911dc30071f

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