Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb8fddf05356e36…

MALICIOUS

PDF

93.1 KB Created: 2021-07-16 09:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5225b477d62f54067420aa092aa7200b SHA-1: 109b64f8335206befa642756ef0e0bc97c1510f0 SHA-256: ceb8fddf05356e36d4b3a2c65e1ce5262d838fa605deb2d686f8e8bf40b3a74f
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The document employs a social-engineering lure, instructing the user to install a browser extension or update, a common method for credential harvesting or malware delivery. The presence of numerous links to compromised WordPress upload storage and disposable hosting further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/0f0ce408e59c01b7ab3f6782cadf4194/77542376184.pdf In PDF document text
    • https://studiovizia.com/webroot/img/content/files/wixusuziwifukavan.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ada3fba2f97---retofitunakem.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9a7d44909---lowilimojabutetesel.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/13062666577.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd0b50e32---22328613067.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607672f48f780---wovozexu.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bac54795d6a---kuxivebided.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/22599986696.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/d6bd572e913bf2c832467aa7f6f1b6d1/74604133131.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/38843661916.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/841a82e6db1ae68b1be43e68f00e5e7c/94318637309.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/65df99f37250373bf7febe4d6f14a08c/silipawolibegovizodonuxiw.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f69db9bb2---12892819460.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926c08e61fc---nadevumupeloduwanamon.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6640dc96a7---fekubu.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3a807ef11---94529978247.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/4p04qk8ar9l83rituv70ms154n/81819912090.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///vosegumudat.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608815ab3dcd6---65250781013.pdfIn PDF document text
    • https://t2sc.me/userfiles/nojifelonotiwusotelute.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080747881e5d---vavusopupawix.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9059c34f17---girezorulowo.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ib3jdhivq5tra6u909p1ai29vi/fonejoluwidowataf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=buy+instagram+followers+with+free+trialPDF 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_off00010642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10642 11012 bytes
SHA-256: 938489433ac5b8a2d16967ae8f82520f68d9ccd86261bf50677e1a2f01c231ec
font_01_sfnt_off00011fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCD 17424 bytes
SHA-256: 510593629be1b5f483a505f75e7d5624e5046f579ece3df6dbb562c2d6ba413c
font_02_sfnt_off00014d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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