Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c989a60daeb021…

MALICIOUS

PDF

73.9 KB Created: 2021-09-27 18:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a3fafe9337cb714013e7ef278b853fb1 SHA-1: 610e539f4d40a207b85212e5930b040b3d370cd7 SHA-256: f1c989a60daeb021406510ad254bec1004440dd9b00668870fd424ba3e94bfd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a large number of external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://crysiq.ru/uplcv?utm_term=love+in+the+time+of+cholera+movie+download PDF link annotation
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16149ecee27b78---8688079965.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/28209716817.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109270401366407.pdfIn PDF document text
    • http://coffee33.ru/archive/file/gobapeju.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/37287823394.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/e38aa0e899c973d2407d5e09ded7f2a0/28508370596.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16144677dd39bb---mewamomugomerobizuzigi.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/jodepiromimu.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/terinopexunenewaxesuv.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/67807033179.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/jeniwipopifawekiru.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/62794090409.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/88614296056.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/31328284139.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/dogalokamidogudovika.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385f0222669---25199405776.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/likajil.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/93677444295.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/sogapexuvukanezediz.pdfIn PDF document text
    • https://fong-cai.com/upload/files/33199363659.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/23057255390.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/7728039363.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/fipipujelezuzojexoresuf.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/rererazamabejebowi.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/27740107667.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/xagufis.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356fa810753.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/tm3krt5nc8dblvq7pjnv9tqec4/24400757506.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_off0000b74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB74A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF61 10684 bytes
SHA-256: 6f2dce464983bc68b16ff0123ce262c98cba0582422188b08f5f165b90e644b8
font_02_sfnt_off0000e7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AA 19064 bytes
SHA-256: ebf64ce4a9ecfd0526d178e21a87c7e6ea0354851e2558d5103cd938e9520a6b

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