Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6aac31c0f4244fe…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 04:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d4f76fd8e7a3440314c44e56fd1b0707 SHA-1: 0b52aaff5c58dddca6c3381a2322b5cf1f487d63 SHA-256: b6aac31c0f4244fedfc38dac5b36612046b56fdf95b6a1537c59c502bbe7cabd
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://crewmak.ru/uplcv?utm_term=how+to+change+chrome+to+default+browser+on+android PDF link annotation
    • http://studiopetrilli.it/userfiles/files/61686010674.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/32478134323.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/bibevenubinilizofirepe.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613543224e44b---62766266455.pdfIn PDF document text
    • http://wmsone.com/eimages/file/44106384865.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131232f48ef9---73575054247.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210909_F1801CE71DA8F67A.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/dajilukosizofopuzexugamo.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161401ea92d738---raxejuzokuze.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/68933739455.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/5769c852c973851979b2eec046624b30/93300416948.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/78544750865.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/binoge.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/41720947173.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/smkjh7nrv9dibbch18hd9h1247/guwaremulu.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16138079251b9b---wubabatokokigoko.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/9307d4c3de246769b3c6cc96b98b6bc9/xobuwokisapiwol.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/sabajagafazasiseduto.pdfIn PDF document text
    • http://gorillatheory.com/admin/upload/file/rilarujopivegoguridisufow.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/71688156040.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613688ba55d59---63453820845.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_off0000d82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82C 11240 bytes
SHA-256: 200ad08a2b9e1aa849533581c51723c3fe7e5024df247337f67ceb746117fce8
font_01_sfnt_off0000f21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2F 17656 bytes
SHA-256: fc9649677fd4e5b57644dd186d7c5dadd89ae4a93c8e0b6d3b9071ad131c7c08

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