Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8ee584f2c39963…

MALICIOUS

PDF

87.8 KB Created: 2021-07-18 22:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8e5060a345cd7767643ed43cb3003c2a SHA-1: 353c926e198e97fb9561b77053fd2dc7d0ce6206 SHA-256: 4f8ee584f2c39963b31293af9135b7dcee1b7842a8e8ebb34294405643e3ebc7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The 'SE_URGENCY_LURE' heuristic suggests the document may contain deceptive language to prompt user interaction, further supporting a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://abnicum.ru/files/file/mavofamat.pdf In PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/50450498652.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d6ac0e320---13225030903.pdfIn PDF document text
    • http://masonlegacy.org/clients/61515/File/91094830257.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/18474297745.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/jepewinagisigonepasamexu.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/12384596636.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/35472391035.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084717ece975---wogexal.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d038c7a914c---61628076902.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/mipijegaguv.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfcace4a28---25232408853.pdfIn PDF document text
    • https://newoptic.mn/uploads/files/fisaritorerexologez.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/6765460378.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/ximepenam.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/navuxag.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/30738602802.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/62186494415.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4357066681---wugapo.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/26492477697.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/simomiwefovulo.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/67664814654.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/pitefega.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/dirogakel.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/aa8ab50586245403280532aa2efe6022/lofibepileba.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/42883ac00f18ab10814af22b167b0bc4/13530211070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=class+8+history+chapter+4+questions+and+answersPDF 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_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF5 16836 bytes
SHA-256: 79a786895b86007769e51bced91318564e40d6dfbdcc38146fea651f31ada8f8
font_02_sfnt_off000136d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D0 11376 bytes
SHA-256: aa596e0bd8190fbc5ebe499b9cfd81e93162d79ef9dfb6963d0877f2af1cb570

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