Malicious PDF — malware analysis report

Static analysis result for SHA-256 1668173e3186a878…

MALICIOUS

PDF

73.2 KB Created: 2021-09-08 19:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c5f255b5e212762e1649d24603a9e5cc SHA-1: 1ebc8ca2a3735e5ca4b3881e03682d8005d07746 SHA-256: 1668173e3186a878c9eeca3bcb9e9703e2258107f4d8562255ee0b76de1e0978
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

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 http://leylasuren.com/images/userfiles/imagefile/busosaxetesozoxavis.pdf In PDF document text
    • http://sushistoryus.com/uploads/files/jotorapetelajugizamo.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/sogewikufevegezaz.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/78577568450.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/46639804693.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/kanejosewevujokidedejok.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613010aa2fe8d---banasozejadipefela.pdfIn PDF document text
    • http://decaiyun.com/upload/file/21090816385694104981insir4d672.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/25134528903.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b84a03d89---56735120051.pdfIn PDF document text
    • http://veitali.com/upload/files/wuniwosifola.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/63641642870.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/53304155184.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/51149095502.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210907093521.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/79040171771.pdfIn PDF document text
    • http://www.ezmoving.com/file/jawuvasatubupaw.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/10165186034.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/54840459864.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/jofigedu.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/wexuxurifusolijevali.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-8/20210908060605800464.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131afed2e3d2---sitosofiminikamidiwusetab.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131758eaac09---jajepeporulawizol.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/98291283636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=pathophysiology+diabetic+ketoacidosis+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_off0000bbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF8 16080 bytes
SHA-256: f4bd06a959cac69e716a73284559ce647c8fe8391d757a553630799ba5679cf7
font_01_sfnt_off0000e511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE511 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD28 11040 bytes
SHA-256: 223d170410374dc2b40828511cd44b72ae0e0858e134837a63bcf2a8274274f0