Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc1a3b05c04027f…

MALICIOUS

PDF

89.4 KB Created: 2021-09-01 00:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d32b155da4c7963126cea3e10b585aea SHA-1: 0a9d4151af26ba70ebfddbd34bd65f533eae43ea SHA-256: 4bc1a3b05c04027ffa22d61865c808f75df704df53d4c4d3ac3a751284f6befc
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to external sites, including those hosted on compromised WordPress installations. The document's structure suggests it functions as a link farm, likely intended to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://fkhd.cz/data/img/70738038240.pdf In PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/142d6f84d8eb1836413fd14bfd454dc7/wedogafelufali.pdfIn PDF document text
    • http://usa-ex.com/kizapasebavujofuzapukitip.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a16e65b5300---60478292074.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/tupezino.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/ledemiximujebeku.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210605105009.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16252012353843.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/47773157489.pdfIn PDF document text
    • https://adci.vn/data/upload/file/26098973325.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/3478940758.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/45906827477.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/qivhbem92u2d3be514b5u7gf8f/fonunu.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/74460200700.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/kixakazopuposo.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/34256680387.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087c45bba2a3---kodebusodotosu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/s4donigq7pbmdij83ms3tqih05/75004583196.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742796ee2fa---69827649951.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081724f0d9bb---vikuzugujadin.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/73580571f497bda2ccc96b99c3f2977c/86155149804.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/sezajusikabawusineko.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/54869636710.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/gogeluwazopudefew.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/zobarove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=does+blue+go+with+orangePDF 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_off0000f555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF555 19612 bytes
SHA-256: 9e9fd10ab02ba174923c95da9c6f6a5d9fed21fc08214ac4e190015c227e5b8b
font_01_sfnt_off00012713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12713 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2A 10712 bytes
SHA-256: 188b5f25d35165d9f43d6ca7dcee254f1c17fce2531fbcc0bfd53d740c9f3781