Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6cc43c042719b1…

MALICIOUS

PDF

93.4 KB Created: 2021-09-07 09:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 16a101901827d2c1d3e1e718d4ce6e3f SHA-1: 0986007ada4e603d7f749c380e6163e468a38ee8 SHA-256: de6cc43c042719b1a9c193dfeb2a2098ca79cd6f03e34579c7bf0e6a9d9f5f47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. While no scripts were extracted, the embedded URLs suggest the document is designed to lead users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/e96b7878c449d4e38d65f3a14cc0aff8/14957671607.pdf In PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/19360b4aaa7b769aeac43fed29ff9f3d/76152034223.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fd79f2aeece---13922581509.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/dolidil.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998d9ce7541---veturusuluwasamofosuze.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/cac207d880f563336d94741b2a1d4cfc/96290638514.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/zisetikibilolafafebetelug.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/govasulawiluxisekakak.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/vogawigonakepulamisefore.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/newewuxozemovufejom.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/64716777669.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/7769a7ca8740e449f0e4f5d2693c22a7/80653129267.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/r4l9h70491mg82qfg7p1i43p9n/raluvanebelogeleka.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/zebawopivoruz.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/23c0835df1623ac7130b9b3a90f2620d/fimibojeposejulasodawavu.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/24790173118.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/juxibitifomerexuvin.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c44e47f050e---70029534869.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd97632c024---6511633103.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b72b4a0fca---80319342960.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/54072276429.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/acd276ec68b5f97db7d0f3a017d8afe7/makazexape.pdfIn PDF document text
    • http://laduses.nl/image/file/kuzepuvidu.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/foseguz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=como+traduzir+um+documento+em+pdf+de+ingles+para+portuguesPDF 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_off0000fc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC85 11156 bytes
SHA-256: 0fa444f67e0cfe9a9fba8bc8d91f5236a6970c98b6d5c03212498a9dd0a12402
font_01_sfnt_off00011670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11670 22224 bytes
SHA-256: d08e4011389b35fbf90ea8fa2971a3053d919938576ce214fcf68429da9e19a7
font_02_sfnt_off00014dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1