Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8313d478622020…

MALICIOUS

PDF

74.5 KB Created: 2021-08-07 03:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 42188f3ebe197253672537a169d1eb52 SHA-1: f841085d4ea56b547659c660134a4ac5d927975f SHA-256: 2d8313d478622020816fbffc6c8d2c9ba45ed85e5b3e752af84a48fd6f8f0c5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URIs and is structured as a link farm, likely intended to redirect users to malicious websites for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://irlanc.ru/uplcv?utm_term=nelson+mathematics+grade+8+workbook+answers PDF link annotation
    • http://edgecs.net/documents/tokodaduduxubigaputare.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/88b28f2c6e8b4960da38629e9fb2c93b/gaxukejivilasidifinopiw.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/1848280540.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/65719390538.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/punilume.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/lanejuxirulekali.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/f7586a6a36b2f2b01d335a39ec1de513/95606575471.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/938ccf8c8bb39eee53cccd41eb479992/61842392777.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160800b3dc0938---60309189077.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/wuraxip.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/riwovogi.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///59591558804.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/729238ad37f180b3242af4bd9c01423c/76091588350.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/dutaxaxepiwijilumumin.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/78259651390.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/37382712895.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/40138306299.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16082e9a98783f---38843252462.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/saxarodexele.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/1198ae767b5ff3eae878a368e233db6c/8031125142.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/musesojoma.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/60137526834.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b398eb54a56---sorepopugalo.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d70ddedfd26---luzizodalunonimetemaxebik.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_off0000bd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD546 17540 bytes
SHA-256: 7ed26d1edc42b6bb93dd0e4fe579fe62411483f1970dc0be35bda4a5ecd83eab
font_02_sfnt_off00010123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10123 11320 bytes
SHA-256: 93a61980abc2c920bb50d7f3f6d81d3e6d22a2ab1afd6a0471686dbd6d868743

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