Malicious PDF — malware analysis report

Static analysis result for SHA-256 82943fdccff22811…

MALICIOUS

PDF

93.5 KB Created: 2021-09-05 20:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4458c9a74c9c7f9e08fe7dfa70e5341d SHA-1: 7e45e61973b96d2219cb29284bd9dfabd41fc560 SHA-256: 82943fdccff228116f0c992882e6421cba51156569757e2c7403c99269a455aa
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 phishing or malicious intent. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest this file is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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.maderas-navarro.com/ckfinder/userfiles/files/gasimonin.pdf In PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/kewun.pdfIn PDF document text
    • https://indianpowerliftingfederation.com/userfiles/file/kitopaguzawiwopezo.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/72897044544.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16092cf5d78140---nobinumonomadogusa.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/buxugeripoda.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/kipowixebisuzitogo.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716e6695df5---70931714300.pdfIn PDF document text
    • http://rsst77.ru/upload/files/josejabewasuni.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/lvfbhsd2sncpr5kddpne1bnr93/wemurazis.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b250d69a14---nobijixokopevatok.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/16e13a5ddf4db0f76b914b82d7debda9/taxoparigexumeju.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124f170af3a2---68690787416.pdfIn PDF document text
    • https://cmf8.ir/data/file/kamajemipuvebavozaxoxevek.pdfIn PDF document text
    • http://rrarental.org/upload/file/91848322848.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/5586117372cf86f2b70edbac66d4f0fa/tegopiwikefoxubotozile.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/97f127fb71bb2ddea94ae45a9e2327b9/kixajo.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bc2d87aaf---7419738359.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/2776406472.pdfIn PDF document text
    • http://rideco.hu/upload/file/manaku.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/gepibikafiluwirofupeto.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/72721882627.pdfIn PDF document text
    • https://eurotig.ro/file/zaginuduxowixoxutoxakofil.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1997946365353ad6a73dee4fb36cbadf/judidigazidafopumib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=cnc+milling+machine+fanuc+control+pdfPDF 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_off00010539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10539 11028 bytes
SHA-256: 87e2334df6ea244b08855795b2670c2555a980eccc1d4761d877e8de5fd317f2
font_01_sfnt_off00011e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13688 19184 bytes
SHA-256: 1e44c9244994afab14de059dd90e8e8e736a3a93c90b32f95dde4715f8c7e426

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