Malicious PDF — malware analysis report

Static analysis result for SHA-256 bccf5b20564ae917…

MALICIOUS

PDF

81.0 KB Created: 2021-09-09 12:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 439b9fe40f66ef9a3f4b78990016e314 SHA-1: 7d284dc4d85bd00148b329dc8ceb2f99e137b457 SHA-256: bccf5b20564ae917aeeef1b9918395a359b54e7de633ee32aabbb825bd345da0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a browser extension or update. Numerous external URLs were found, many pointing to compromised CMS uploads or disposable hosting, suggesting a distribution network for malicious content. While no scripts were explicitly extracted, the PDF format and presence of embedded URLs suggest potential for JavaScript execution (T1059.007) to facilitate further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://crewmak.ru/uplcv?utm_term=qt+development+for+android PDF link annotation
    • http://apexibd.com/uploads/fck_uploads/file/gumizijexujapofet.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/29id1t5ljgj2tab2q258dqgj31/15004044836.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109040910304473.pdfIn PDF document text
    • http://turatabor.hu/media/xesoberalefimebe.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/39230004956.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/72513952598.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/gozibupezi.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/benasasajuzafegilipi.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/nonumunevudi.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210905080858.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/kefepapizosarav.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/sesujunivobusakuno.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/rasupezajupomesojukifa.pdfIn PDF document text
    • http://protok.pro/upload/files/11112194218.pdfIn PDF document text
    • http://aurora-c.jp/files/files/kikagu.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/rujatus.pdfIn PDF document text
    • http://kisito.com/userfiles/file/tagoj.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4f1d09cd2---wifituzevigawolelirovewuv.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/41838369320.pdfIn PDF document text
    • http://healthywithhart.com/res/file/58920566714.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/9514893997.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/posafopuvunupobukadox.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8f2d72128b25916916b1c2c909f5151c/dobokejojira.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/38176941056.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d1831b1c6---5180381473.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/jedifegubojefumogawosek.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_off0000d779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD779 10616 bytes
SHA-256: 599167f7faad88007b7f3bf6253a1634b5f7d6fc86de86bd190a11e831d63ca7
font_01_sfnt_off0000efbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D0 18116 bytes
SHA-256: 132b2f10fde03c247c931407fc673a927a20d6c778c1b489b6eef5377272469d

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