Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4fef760790d5a17…

MALICIOUS

PDF

68.9 KB Created: 2021-09-07 00:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 34a3e702f81b5d748054d65d00b3f492 SHA-1: c347d457d0ec848dc4d09b73f8cc633d0d07a6a3 SHA-256: c4fef760790d5a17b6a50cecad2a15944d55ae6b97de2e6901bf7530ed066b7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These URLs are structured to appear as legitimate file uploads but function as a link farm, likely to redirect users to phishing pages or download further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://archism.ru/uplcv?utm_term=kyros+rointe+pdf PDF link annotation
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/0d5751e999aaab557676787a95d42375/dajasalunivulapaz.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607600bc92be9---48700107466.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a528d35448b---jivovizubidebijidibesug.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077427d6add6---14729022406.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/sisavaveramip.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/bbcf9c6c538635971fd6b8e5b67715c2/xerovukumirukofovezu.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/sasolenufe.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210703_192949.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886bde51cfd---migibezoma.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/zaturuduvokop.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160948ff83493a---vujitutovepipamasifupef.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bec4dd75e---45241638089.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/202182849169555.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/22682096988.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/menufusozunoviwe.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/818338ed1943765ddd051313f62a8871/fujulorudilefowuxilozexot.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/mamogubujodowonepela.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/78537135586.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-5/20210505103453146897.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5ujlaggk83smkrgrve0grb8up4/90811004732.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a0d965987---jafowufes.pdfIn PDF document text
    • https://vleek.com/uploads/files/84740666453.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/jolunozagi.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b34b415d8d---84421872048.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_off0000b2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D7 10388 bytes
SHA-256: 386df0af6bc363fce4b5d121dd140656555c6d395f8633f4cac7d5f6f1a795e4
font_01_sfnt_off0000ca75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA75 14740 bytes
SHA-256: 78d77316c2b43996a773ac6fd2004f3a8153f8d899e2bb70fea9f4583dfb5e10
font_02_sfnt_off0000ee97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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