Malicious PDF — malware analysis report

Static analysis result for SHA-256 6635e713776251cb…

MALICIOUS

PDF

90.3 KB Created: 2021-07-07 09:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a5ba674d6043dce3c01657c493bcbffe SHA-1: 4db57da53419360ec310fe497bef88c448e80d7b SHA-256: 6635e713776251cb8ca1c831e972c6ccd489a6d00937ae8e3ed8f31fcf0caea2
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous embedded URLs point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body was unreadable, but the heuristic firings strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://garglob.ru/uplcv?utm_term=thank+you+email+for+quotation+reply PDF link annotation
    • http://bannails.com/fckeditor_userfiles/file/relatuxeme.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/jogivudezitifakumop.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/siratufezur.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/cd86619188c5da66c7588e37f4eb4f10/rulagojulipinipaxuk.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079b4b99090a---29019230371.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/b90ifb96f4co52r03ejq9koon5/82070408660.pdfIn PDF document text
    • https://armenia4d.com/contents//files/fenivo.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/51635747883.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/fibuziz.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/57487910001.pdfIn PDF document text
    • https://biocoils.com/img/file/goxiguz.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/b7b3ffc2d59b739ab0fb973698535c45/dapizigijirew.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/77580196492.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/5761233548.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad63de2ff0---vumedewidagekopikut.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///zaxapowegojimi.pdfIn PDF document text
    • http://emurus.jp/userfiles/file/91232111651.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bf0caffd9---18121715873.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16087004da6af8---38465348716.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/80848616287.pdfIn PDF document text
    • https://cargobull.cz/res/file/96098824265.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/m9ddtbi0euihqgdmhqd3slp7a6/54618784587.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/40562533776.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_off0000fd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD34 17424 bytes
SHA-256: dfe5be1a228a4a9f9ddd2f0a99721302172f6e78de52788bfb6df56dc7e224e8
font_01_sfnt_off00012b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B19 10868 bytes
SHA-256: 613e128f6f9c51355e451892ca17fbe86c32a959775ba9856407610345249e57
font_02_sfnt_off00014401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14401 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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