Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9a4eefa66e6949…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 13:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 9b2e49362bc24fe60ac013460e30a2c1 SHA-1: e2ca9536193f1e5ecc4e5d9c674348b8d74beeb0 SHA-256: 7f9a4eefa66e69494410841bbfb46c0eb53edac11025ad7ec083372719f3fe89
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://pixomot.ru/uplcv?utm_term=airsep+visionaire+service+manual PDF link annotation
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/saguzexuvixujur.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/57d89e5f31a54945ec1d70398c020b4d/14962669819.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8c78c9d625---63535075256.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/28216739561.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/146803c7e46d2165af4052aa9446f789/rewutimogekiwomuguzukaru.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/bisuralivasi.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/d43gv11fod28eam5frfkn6u1rs/4656477264.pdfIn PDF document text
    • http://richwoods1969.com/clients/861079/File/95233208029.pdfIn PDF document text
    • http://meta-min.com/files/wigibunimanade.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c106ec79adb---towevaxuxasefanefejofulaf.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4a36c2d0d---xobinipujum.pdfIn PDF document text
    • http://nineslash.com/user_file/file/vuvorodej.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/78398310860.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/6b74e0d01d3bec2a7041c6cca3bbc37d/79866245630.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160f29b04d827d---17503594660.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/nokasasefiz.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5986a3c8e9---mugilogiditonigujaxuda.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/56785485263.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/55050626b3be1b00cdcaead342b45615/xavasedepiposi.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d327c42de0d---gijanabaxemijeneb.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/58476437646.pdfIn PDF document text
    • http://indemo.pl/Image/files/lexodivekagokoxefow.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/sukabawipeminopinuzajez.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_off0000dd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2F 10584 bytes
SHA-256: 5521ea182e1cc09bfd729292f6a6e3419c747444a1622a725d0196d4b5acae43
font_01_sfnt_off0000f556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF556 17020 bytes
SHA-256: 528a2becca031e7ee42de6b9dc08c1a80f9e0472c2ec07f8b33e89e8699ad649
font_02_sfnt_off00012153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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