Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5ad03826d1ebcc…

MALICIOUS

PDF

92.7 KB Created: 2021-08-21 08:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 621baacb473fc91e913f891b644660b2 SHA-1: 91cf965049c3599f1a120f1660d711b0044bab61 SHA-256: bf5ad03826d1ebcc508b5ddf533016e1a2ca4c996e773132b06e10241178d69f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=autocad+electrical+2020+a+tutorial+approach+pdf PDF link annotation
    • http://kimandyoo.com/userfiles/file/lawak.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/pisuloluribobu.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/85132928198.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105191216314044.pdfIn PDF document text
    • https://krippner-schroth.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073fd6240d71---51872496030.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/nu5sbplkt9k2sheanltr4bmoc7/80003618552.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/9b47ec7f11b849161da5a76fcc94383c/lijivanafirerinalirif.pdfIn PDF document text
    • http://toyotarentcar.net/FileData/ckfinder/files/20210624_198F1D54FF281A79.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c606a3556a1---wekuxeduniselizopadopasu.pdfIn PDF document text
    • http://santabruna.cl/upload/file/6386487879.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/20347119413.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/74995153670.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/93682133291.pdfIn PDF document text
    • https://ahha.az/userfiles/file/batumodufebod.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/aafc2ac11bc7c004d629797a2ba844e9/90816342866.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/narinovo.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/meduresezarugupulix.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/jebarubebogurumowe.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/1h02shbhb2lf9ueeebvreiebob/vodazidiwukibevakakabeje.pdfIn PDF document text
    • http://www.centralperdana.com/file/pisarebapasavaruten.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/saxozezu.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929e6a238fc---71495219708.pdfIn PDF document text
    • http://janyska.home.pl/_mjanyska2013/fotki/file/wafipejunenisepebi.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_off00010063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10063 18768 bytes
SHA-256: 04f29bc77d23e99dac9c206c3260c84e52af11a629dba5b7d65a9422b608b48e
font_01_sfnt_off00013208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13208 10768 bytes
SHA-256: 332a9dd198a88e0bc52d041ae0ea482a327abdc95f6fcc22c6f09fe8af242a52
font_02_sfnt_off00014afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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