Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca601816bed841a1…

MALICIOUS

PDF

81.3 KB Created: 2021-09-21 15:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c0fb9cddd0d9b45414635ed5954d6731 SHA-1: 31d08fd275ed946b63f9b9c63f9eebc9bfd55e76 SHA-256: ca601816bed841a19e603f7b98207c3879f5a3ef64d328f9a37e79913d9bee4e
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised or disposable hosting domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/c730a13e10587207ce63e89796a6815b/xuvovimixoboji.pdf In PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/gusamegixonerujavuv.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/3293563240.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nmupocq9nmnkkt1b5fk4gokfe2/87945650319.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/16966306330.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/wogijigezonozo.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/rurugidobanegafipi.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/xajifinijujanasinubaje.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/sebovugoxopodo.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/rabako.pdfIn PDF document text
    • http://vodnik48.ru/content/file/ruvebu.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/27570958580.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/79809344518.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/24962411585.pdfIn PDF document text
    • http://newshop.jp/archive/file/70148621482.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/pewanadafa.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/25532342316.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/uh7nvh39iu4dqr0jaaceupse4v/78482517518.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/nuzefewe.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/kiwirudibebaviwenaku.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/23852400225.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16139616889c38---zipaguliwol.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/43023766437.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/ritowelinojakarezug.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/xegojobewakew.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/45188966393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ielts+academic+reading+guide+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_off0000d92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92C 10896 bytes
SHA-256: 1fc04bbdc7c2c19cce6e709c672b5c94db05938cdbc809c150752e569af2669d
font_01_sfnt_off0000f226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A38 17528 bytes
SHA-256: ade27f64d26c1ec2d32c384873f0063f3ee49035cfbe15f56fd77e188dd4cd3a

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