Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb4267e6064ce2a…

MALICIOUS

PDF

90.4 KB Created: 2021-07-26 12:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 09e59576cf349d13cef4c27b40221940 SHA-1: 40c5b2e84509c9ee5b7d8ad9da0a0c4e5928ba98 SHA-256: dbb4267e6064ce2a7d2d1500846c3bd7dac3c2e120626c51788de8b64b693433
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'Password-protected archive handoff' heuristic suggests the document's purpose is to provide instructions or a link to a password-protected archive, a common tactic to evade security gateways. The document also contains a link farm pointing to compromised WordPress sites, which likely host the malicious archive or a subsequent payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • 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://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/b2da65f1d7bf91463d88683328a4b558/73825110238.pdf In PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9623b9daa3---livaxu.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090f2bcd73a4---84713828008.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///80498414444.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/39656836968.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/wozesufuwivifewodolu.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/zekironogexekexawodalojat.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/9267217270.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/sagerumimijewiwaxufok.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/bqa2kpuh2ivft9a6gfa24esgd2/3470468723.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/mefib.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/gisineda.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16088d5a38d95f---vowesuwojoxet.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d81d6b798---31428235356.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/51160227365.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37729d9610---77659834828.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/22398169774.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/fexarofonuporexu.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/u7rqiiednv2l7v3048khql9o5c/90839316736.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/eedff137ed74428f1e967176bfd00dfe/jesalujipanubojisanufira.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/dozezeteruvera.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c113d55648d---gazeroju.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/5a9b3ebea66c20046ca3cc82f3dd9328/46503327952.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/dezerojabizemadowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=daemon+tools+pro+serial+key+freePDF 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_off0000fb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB80 17792 bytes
SHA-256: 6b254aa283d880eb973ad407dff214be426be40e88ca58989046f66f793f2513
font_01_sfnt_off00012a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7C 10724 bytes
SHA-256: ea914256d30f26aff25837a32a16043f2c9dc1c7b8800abccc68f6875a0bd82c
font_02_sfnt_off0001431c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1431C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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