Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a3d587c0c6f797…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 16:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f1505c543f2d4c1bb60b341b1df145e2 SHA-1: 0b3a9713947c5716f954172331464b6b0ab45941 SHA-256: 89a3d587c0c6f7972c1c7d4ed207f1b517ee400eb3a406192b04939b362b957c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI links and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dansecyr.ca/pdf/file/xofimiwixawe.pdf In PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4dd68cc2---22186889126.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/45628823010.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/zibugofokagurojoxipifid.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/lokegamamesonixeganawusu.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/furunutoz.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/a81034bf9789900be009db2689dad3e1/45103533736.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/05260e193ba2d211529dda727db57c5a/48224250033.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/zisukomivasuzid.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-8-18/20210818170757948386.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/31f54211db52c222c42e5d06ac0fc53b/jazawalifuj.pdfIn PDF document text
    • http://saxons99.com/clients/5/5f/5faa49e4155ddd0d4faf97b0d7aa3dde/File/5751772802.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/dapokubojujuvatepixibo.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/edc4123d56ac231387d03e7789aaf1f4/dijarexolugozexujuzusoj.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021080416445594.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/54823823117.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/a287a818014759ac737bf7dc019a6cca/dojagat.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/povaz.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161031140d06fb---duxabowo.pdfIn PDF document text
    • https://megashina24.ru/files/files/51388386462.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/fijemurafowesele.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/66876635102.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30367441163.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160811998e7b4f---21617970851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=grammar+worksheet+verb+tensePDF 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_off0000da34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA34 18776 bytes
SHA-256: 2515bc1bd175a62af8d1191d6226801116b6c6fd49502878d669d6b9a9f17ca7
font_01_sfnt_off00010b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001232b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232B 10660 bytes
SHA-256: 7ddf0ee1629ff2c13ffae73f6d2fd253cef92e7c32652e5d2de3387018e6ffb7