Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e0b1fabd6786a58…

MALICIOUS

PDF

83.6 KB Created: 2021-06-27 23:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27361f5733a0c7157f72d4032f2e3580 SHA-1: d24a524f425e44e6610bda9123442f231c5ec929 SHA-256: 0e0b1fabd6786a58a3a49c1bb1086c986e051b2bb93d32552cf8b5d2ede4bf1f
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be383ec3f7---repotopirul.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a108c26aaa1---vokukarifopiw.pdf
    • http://gayaarchi.com/userfiles/file/20210523125627.pdf
    • http://cephedanismani.com/images/pages/file/joxipuvebufoduzasofubedo.pdf
    • https://churchofgodinjamaica.org/app/webroot/files/49336635683.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/6f0c1f01cbef519db24ee6a5253e8b12/zudemudoduxop.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/f4e104a2b40224f5ef11f32025d58bc0/nitajidibel.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/5489cf7640a05280415c6a4962332828/nugedavinojebetipunujig.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f7b383f4807f9885beabc440345eb573/8807727971.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/4e10f94b089fd9e6a938ba0f65ea72c1/tofabew.pdf
    • http://derma-dts.de/files/file/dixebosejunemojujugizajek.pdf
    • http://maasmartcity.com/userfiles/file/sijit.pdf
    • http://allmedicus.com/userfiles/file/23943920052.pdf
    • https://almuhja.net/ckfinder/userfiles/files/4624347054.pdf
    • http://cesmclassof68cheyennewy.com/clients/82478/File/11186495872.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b01dda9f984---javuxubefipuwexumoz.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afc35908253---kevofewigutani.pdf
    • http://altaprecision.com/userfiles/file/69540492015.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3cf602c70---57618143004.pdf
    • http://hibertek.com/image/files/20210619_104201.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/b6f80d7177a9167a0d592071bad0313b/liwir.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/dbc6fc9fea246d43198dacaa26dfe363/56302188109.pdf
    • http://zamokugrofa.sk/admin/fckeditor/file/texarubone.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/n5ttrejea6pic8kp52ka57mm75/11569222194.pdf
    • https://universitecentrale.net/uploads/FCK_files/file/22708464848.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=difference+between+financial+accounting+and+management+accounting+in+tabular+form
    • 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_off0000e353.bin
58780791d89725698379ed3476d0839e527cc69075d18453ab622991ee9b9069
pdf-font-stream PDF embedded font (sfnt) at offset 0xE353 16700 bytes
font_01_sfnt_off00010e8b.bin
4261d7ed79de97b4ef9c4ecfceda4327e3fc3e9fc42f35d0bed67971e8923934
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8B 10976 bytes
font_02_sfnt_off000127e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127E0 16792 bytes