Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ff27b53efd4e1a…

MALICIOUS

PDF

83.7 KB Created: 2021-07-18 09:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 78434f20aba9ee6f99fe7e5d1e389bf4 SHA-1: 3b5e9c31e1d2d88b621e95b7d4ae847115d06a81 SHA-256: 22ff27b53efd4e1ab5a23739f6605d41dcb93e11389e7a155580a8df8d0cd591
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/bebumoxor.pdf In PDF document text
    • http://chinhsuasolieu.com/media/files/dogiwe.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073049dec925---22212677986.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/94577853117.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/sotutujuduwusafovolir.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa6b7e010d---38643360055.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2bd3bc4ba---vatuja.pdfIn PDF document text
    • https://educhina.mn/editor/files/65905307385.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/e39e72438c84ac99886eaadcbd88fab9/60236117762.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ldekpcq4vvdlgfem3o8c5dle06/baxije.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/37869324172.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/8ee3aa31bf2ee0218b64733f4e1ec03d/3818481591.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98ce1b3e00---86063088301.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eccd3ea264---rikufudagupevesuwaj.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/27327458199.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/92585385300.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/penukuminigiwil.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/9e20e756059a526bf0fe23082c474f18/geponakopurimovizik.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607eae6ec358f---86767714957.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/91194042208.pdfIn PDF document text
    • http://citra.cl/userfiles/file/kalubokabibi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=he+breathed+on+them+and+saidPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE533 10596 bytes
SHA-256: 5f4bbd6cec260a7955ee9e662cedfc92a74e77fbb2ad43e4b7bc4d8b52f42985
font_01_sfnt_off0000fd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD28 17156 bytes
SHA-256: 38601d9de193fd9df7d367aab5a57e913329b4913d6e59ea3624227d0fd77de9
font_02_sfnt_off000129fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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