Malicious PDF — malware analysis report

Static analysis result for SHA-256 862ed2630c810a0f…

MALICIOUS

PDF

91.9 KB Created: 2021-09-07 21:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 92a82c94b93e99a9e799bd4c0877e433 SHA-1: 1b704666477b7eb4d448d202aec947359925fc63 SHA-256: 862ed2630c810a0f143ccad59b5a00b8ba8cf6c62d19797ad30592780148d70d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories, suggesting an attempt to lure users to malicious sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the phishing or malware distribution pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://cructi.ru/uplcv?utm_term=optical+fiber+theory+pdf PDF link annotation
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f20376acfe---35763320344.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///juwesikapab.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/67be595943b0471ffca874e4aaa92a46/70684525629.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083a3732277a---turajexufow.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/jv5n4uj7h13cusk733pn66bgl3/74261140448.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/gasapuvakebakufezojada.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/zefil.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/gasubomezasivonalegogijus.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a628a76dfee---zepajixakagesaw.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/64711901546.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607782a5b179e---59757727067.pdfIn PDF document text
    • https://jobtiara.com/files/files/natiresu.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/910a96cdc32aaed97a5e97217a2f19f8/giwuj.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/99746064817.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/bfb14acc1b40b1a7e5a7c703f03c479e/pipelenivat.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608681ac98c20---bibekesebusu.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58923070958.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64499843983.pdfIn PDF document text
    • http://summithighschool1958.com/clients/71652/File/tawexenojosigit.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/2356334794.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cba1c1a42---99749955323.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/19609268185.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3b201aa2d---visarakevikitotakunosub.pdfIn PDF document text
    • http://ciskmv.com/css/file/puvapipetir.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/fevogisodovagudapuna.pdfIn PDF document text
    • http://popmetre.com/news/files/lixamedaxegivumebi.pdfIn PDF document text
    • 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_off00010137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10137 10724 bytes
SHA-256: 6c80c9b724e37ab7534f1b8a475cb8cb6d24f22db68e5c92c8134facf511f123
font_01_sfnt_off000119cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DD 18384 bytes
SHA-256: 2f1a0a3590ef8e57ac0b7ab5401e7333b1aaa4eba0a9f3b6bb2098182f35cb00

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