Malicious PDF — malware analysis report

Static analysis result for SHA-256 82146954b01845b3…

MALICIOUS

PDF

90.3 KB Created: 2021-08-07 15:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 189994cefc641d16b675a0dfb9edd9df SHA-1: 11f6cb4b74051d1600de3dc32395812e5cb77ff3 SHA-256: 82146954b01845b36b5ed54c1d3df6343acb7d40f4bf28fe43de5890e3dad6ec
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 compromised CMS upload storage and disposable hosting sites, likely to distribute further malware or conduct phishing. The embedded URL, 'https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=download+twilight+sub+indo', suggests a lure related to downloading content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://termofriz.rs//files/geguzuvekopetameg.pdf In PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73ca884a0d---45056723862.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608545f7f2dd0---62545188121.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9cc969f3e---lutotapiwed.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/43631016835.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/5b10bbe8357a42f082ab0a755d7c38da/30699546228.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/qqlmomup3i7g25r0bks477mv5d/lekejodivavuba.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/fa0400302aa12daeebfa7e95a294b46e/xubiwagozo.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aacfbaa6dba---9756873521.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/f5dqcfcs5u30skoq5ot1uphpe3/banut.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/3e25ecd2eeb3bb65cd0f1e3a26806a08/39830689906.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16087c930db8e8---35858320555.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/wudaxezakulepilizegulu.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/nowizelonudofatomezipusiz.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/tigikibarofuji.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/powidubal.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ksgqp1fejjikkcktct1oria62h/18788508346.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/75516610000.pdfIn PDF document text
    • http://rayer.cn/d/files/38858567918.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/68575000622.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/44990301695.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/bda77b5a2891d0653f337907a5200288/wolosodaxubolugodosaroko.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/46353602765.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210525043759301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=download+twilight+sub+indoPDF 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_off0000fd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD07 17916 bytes
SHA-256: a13716ff26004ca847c8439cf5b209e3102bf78a1d0782a6139eda904ada1fbb
font_01_sfnt_off00012ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA9 10624 bytes
SHA-256: 01e72ea3af3cae4da38c4627abd5e49cdd6fec47ed80016fe272189f798ef35c
font_02_sfnt_off000143b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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