Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b489f8f89b68155…

MALICIOUS

PDF

79.0 KB Created: 2021-06-29 02:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a94189e54f822ae647e51b32da940abb SHA-1: 8f48d74c4b643ba7386db7f44428d5eb6e0d7702 SHA-256: 2b489f8f89b68155fa46fe4e86d0b3c93c80996217dcf1134354d2e341c2b143
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a ClamAV signature and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. The primary purpose appears to be directing users to malicious content, likely for phishing or malware delivery, which aligns with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://krisoc.ru/uplcv?utm_term=uc+health+cafeteria PDF link annotation
    • https://fallsplat.se/file/mokubaxeparupat.pdfIn PDF document text
    • https://etimes.mn/uploads/files/86541245513.pdfIn PDF document text
    • https://capecoralliving.com/media/file/33428974606.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f57338f17a---kexivexiranejinifagirik.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160963afb10051---monefotiwiwudopefoginude.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608acd1681113---98804241203.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/b5ql7rdpf3eqdm2r936ii96rk2/22578695457.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/zuzolazasi.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f143afd79---ruwafibobomakidunipuzurum.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/7330e8ecade41d0fc54380cf3c53d34b/kafopurajapenalalazodeli.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c89a41c08b7---14656637235.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/51907114791.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/77975719262.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080eaba68a76---91281631730.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/1im9ev44i8r6eibj2vpmjfoabk/kufokepidelipu.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1af112814---98833790927.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/wubel.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/lroks1l0hmabarhfim32q7vv71/fozoriwoxasoxuvapemozifu.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/sugalujajajutileki.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/bivajuzewexewapibunuko.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/2dc9b1d73437e28c7e4ba664f23fa9f9/81659721583.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/3808d8ff27fa33b465cf2dcd85162ce9/mopibodusaxizorolixiviva.pdfIn PDF document text
    • http://premsaktidal.in/userfiles/file/96167587466.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba0a3bb60b---wabexexitewosamidivufiwit.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/fabig.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1b496f05f---toxugi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58F 10048 bytes
SHA-256: 090c4231187fdc5975e1fb42b66056bf2c7f2bddc647ee392c6c8fa859b778a3
font_01_sfnt_off0000ec06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10418 16496 bytes
SHA-256: 8c8bf85c1c61b829db8e4059c7dab2efec6ff5362ac4de7a4cf12ac30cbe8b17

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