Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ab3db53ce86461…

MALICIOUS

PDF

95.7 KB Created: 2021-07-01 13:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16053bcd76541031a88a0f84c6494516 SHA-1: f6232f532575acf380364339b27ecaf8a3b62fde SHA-256: e9ab3db53ce864619341b605a383ec186cfae16c5b1e13f1f2368b45dd881ee2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, specifically within form upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially leverage SEO for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • 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.
  • 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://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae13520e1fd---68904579888.pdf
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/73032790210.pdf
    • http://riccaassociati.eu/userfiles/files/tukulazobaza.pdf
    • http://karthikeyanjayaram.com/userfiles/file/11130226102.pdf
    • https://eitmedu.in/ckfinder/userfiles/files/15531819832.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-2/20210502011953236708.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/693a2d896825620a2f89c5d97a6e3ea5/24844242615.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/r25dqd8jdjmb6l2r3b1qlqumm3/76896868550.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc764b8f341---nesakojekenewije.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/0fde2db52632006e82f91c913e7563be/guguvixis.pdf
    • http://vienhung.com/webroot/img/files/zeralumugotidobulogo.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a35f3a61e7f---40553902071.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc31c7e683---80132210752.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/2c2eb29a543af0f5e5ccffd9898df752/vofopurizopekikefelokemeb.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/f792d3bd18a91e9842f78a23ba168743/lizovejunojenalumu.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a412a8e2493---jogixenewuxovozovutuj.pdf
    • http://findmecakes.com/userfiles/files/37413135075.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1608545752ef17---49069828789.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e58a72fcdf---92945714082.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/954c61f4967c09637e9e0f32fe300a9a/53059252526.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac9c421d8f---kanojivuzuson.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/wivoxanumejumuduxivosi.pdf
    • http://mdsalon.ru/img/lib/file/kigobirabevabazop.pdf
    • http://provia-events.de/pics/fotos/1/file/sawarexituli.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/8335bbc5b0c8b94e6b34c77aacdb2591/piveki.pdf
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/16269789673.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4f04ec60d84d80542dfd21a683896438/wawonuxomuwugijut.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=my+singing+monsters+plant+island+breeding
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110a2.bin
dc9311d537a95fcbfc675e922e5f4ced544b3fa1b9dd93b6b2fd9019cf109690		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110A2 10984 bytes
font_01_sfnt_off000129a8.bin
ce6192fa49740f5719f56862ea332cc5f0d9a5aa4b16f972d64add80d082b3bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129A8 17448 bytes
font_02_sfnt_off0001572e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1572E 16792 bytes

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