Malicious PDF — malware analysis report

Static analysis result for SHA-256 6159c0e852eb9022…

MALICIOUS

PDF

95.7 KB Created: 2021-08-11 06:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0b2bd7415fdb92810401249c8a1c659b SHA-1: 043d165b62b98f1c0791152669913d407c3bddf1 SHA-256: 6159c0e852eb9022f7a4ec085f14433457ea09fa01ff0e2689f60fa5cfa08b3f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs, while numerous, do not provide direct executable content, but rather redirect to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://gloriamus.org/Uploads/userfiles/files/26524051737.pdf In PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/xirut.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b318ec858d8---11216282090.pdfIn PDF document text
    • https://ptogel2.com/contents//files/pudadufuwemibelixesado.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210801112827.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/89028715292.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/73159491682.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/rupibuzam.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160728d19e399f---2885511513.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16097386dc0067---24097948955.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/f8d20f2d559fb4bf5c4b4398911622d2/wadozamagaw.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/resipimototoxiwunulodar.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099e2617cacd---sofogikifetapa.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/a56507571f9f67fa29d1b0e97f1f74e2/55762083767.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/90f6dd3a51668398332eab927fc2a573/wofipisitos.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/kijubakepumobifen.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/jc2htcfcrbgq9neb72sge94gim/28400079164.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/jorudewemagisaluropime.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610e0b5836320---5441360715.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/26490719527.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b4909ad88---60615054820.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/54141740213.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c940f62cb9---63933531113.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/m1ld8ifav2d09a3re355gktmql/maxenisarakisawedozetuted.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865b75c9ef2---69073866450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ejercicios+matematicas+5+primaria+maximo+comun+divisorPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E9 16160 bytes
SHA-256: 5c13cceb9d36bbc2bc20aea0fe1d16ac5c722eae827defaa6d249ccd2c25c082
font_01_sfnt_off00010c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C72 11144 bytes
SHA-256: 5d8d8f7aa8733a72873b750c2271aa9eabfb0a85d9fc6a9536da5579aaab035f
font_02_sfnt_off0001267f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267F 18452 bytes
SHA-256: 44d6d95d774b97d5c6ffb09f3e90defd7ab400382f5ff1e2c9000bc9ab0dd904
font_03_sfnt_off0001551c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1551C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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