Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6de0f3d08cac90a…

MALICIOUS

PDF

89.4 KB Created: 2021-07-13 22:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c838ede9bfdc87809890f88c78f00912 SHA-1: 33e5d63b1a6dd2f15315a25a793f749bcced8c3b SHA-256: a6de0f3d08cac90af9de7249e152d6db14457f79091c8a07dfd44c4356d453df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it with high confidence. The embedded URLs suggest a tactic of using disposable hosting and potentially compromised CMS uploads to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/8a9b6bbfa8ac2fa2acb985408bd9076e/47925697495.pdf In PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4af147356f---36648227786.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/dedesiwukafed.pdfIn PDF document text
    • http://irishvaughans.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/relorimavurujedejetebafi.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905e0859f84---12883246120.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/f801ed01e523fcaa2b036e65f4197cfc/ronuvuvu.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/a5437520c1572d2e237d7c075d6b0642/kamile.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077b6f5066e5---wuguwutosenuf.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/02aeacb095d685e176b91cc2982ba664/50277785109.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/xidivazuburus.pdfIn PDF document text
    • https://edarky.net/data/file/25845447925.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9b6db1f4e---tusuxegidokagedizu.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608328028ab73---dijejetebu.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/busefonokubotanogo.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f15a8c37f---76640462672.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/a8190941b49409414a1e5d5d66aca5ea/83995486158.pdfIn PDF document text
    • http://sdds.be/userfiles/file/disuvugagug.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/76677756601.pdfIn PDF document text
    • https://actor-conseil.com/files/file/79872739920.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/rexukemimu.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078a9d273c5b---mazigixowesama.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/78246071395.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/589kpnos9n739qkc33toqjo750/29679908834.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dcdaa12c4---lurezuruzas.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e1dbba282---56972705285.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=top+10+hollywood+movies+2020PDF 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_off0000fb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8D 10716 bytes
SHA-256: 503397329a9de2bed7df8f6c45cbedcc0a94d8ebe94923e9300cc98ec597259c
font_01_sfnt_off00011442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11442 16848 bytes
SHA-256: ed76cf09e0f6a98981eb07a3093afa757fffce88d9886bf0f00a28f334b125b5
font_02_sfnt_off0001402e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1402E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1