Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b890c8f66c583a…

MALICIOUS

PDF

98.1 KB Created: 2021-06-30 05:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 987a8fb6cbce80b81b9e4d20d2c0feee SHA-1: 515824f97a5dc5c95e2cd2301dcaf868178e17f8 SHA-256: b2b890c8f66c583aebd49b352839c3366bbe4c3323e58868ca052391689b6916
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute further malware or conduct phishing. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://huntic.ru/uplcv?utm_term=scary+words+beginning+with+j PDF link annotation
    • http://casadiriposomarsala.it/userfiles/files/20943501188.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16079c168a04e9---gudoguzasarepefetu.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/95272630973.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093cda3aef61---46247758610.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d76bb71d1---gapogu.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53d634149d---68460619504.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/dacee417744d6cb08ca56c6729909f56/32026967145.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/memoweraxix.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/ripimidipa.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/vozibawakarikikobo.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/jasupebasaruto.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/paborivabufemidubepibatad.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a893f6a77f---raninenutedesafi.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/99040139595.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/jetaxuruvuget.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c051f3c81b5---majomefajipeve.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c58019e0187---ludatepajutevivalax.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/wufimoxubiwol.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a19f443fd6227c809302e0ac04472731/94924760586.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b52aaffdd---61743643860.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/8041c67276849c9c6985d4dee9701934/xogekopolepurulogeruduv.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/27701748733.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609a57834fc36---93979439476.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/r285sc9tt6o55iaembnfe0sl1a/14485179027.pdfIn PDF document text
    • http://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/88889922832.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D9 11148 bytes
SHA-256: 02169e8e248acf5cc30d7788ca4874a984e5993a908994051d5681011683a5cd
font_01_sfnt_off00011ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B9 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_03_sfnt_off00014a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A95 17948 bytes
SHA-256: c2ed21f78a16c6ded27b6e553c039a58bfb2c3a65826fd2889dd2da6bb0d5dc4

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