Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc3ad37e2b12a7c9…

MALICIOUS

PDF

90.7 KB Created: 2021-07-29 23:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 86305c54dbb9a32313ceb0419127bab6 SHA-1: 430c9efd38f733d94ccdc8205adcf479d35230c0 SHA-256: bc3ad37e2b12a7c9eb10a87ef70e6a878c491e1e4b6534c6af4b648084e8ca4f
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ochpplc5ea32nj7psdcs0q4e5n/kugemevewomofuwi.pdf In PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ba13da072d1630eb0d3004d4497acc9c/nekuxodidu.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/14707636707.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7bbda6eed---50545213039.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/jidenuveduwar.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/44062867227.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/wulupedanilusaxaxediwe.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3f3caef027---gadilekilomexejo.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baba6804825---45431161010.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/9035441801.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1010743bf---19102653807.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/risopuvokasoko.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f0876f2b4b9---tibosebiw.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/584f93370742a9ff81ab8b3fbceae16b/xajedokutibila.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/07gcudpkpsae1nqoi7onm78m03/13308496394.pdfIn PDF document text
    • https://arerp.kr/data/file///56299331946.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/fee22b1a10343ce6182bf96070723853/4884138231.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/valusakidelusaxojakiw.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/0b02bbe82d1f94d2f81f774ddab2998b/1232971141.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/93159514306.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a95ef6b642a---kuzapesonufusenakikok.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c5cc9237---19630471880.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/xavozuxukagir.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210730_553C513FA765C81B.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pokemon+leaf+green+randomizer+rom+hack+download+gbaPDF link annotation
    • 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_off0000fb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2A 17528 bytes
SHA-256: 306abf82d17cd18ee5d765488de54ae5a824f3c9df9a391fbad7cf0249d0958a
font_01_sfnt_off00012935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12935 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001414c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1414C 11036 bytes
SHA-256: bdb6bfe2371b09b490ddb551ae4955f7a3c54c87201bb34b0727b96be4051de6

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