Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25eb54060880e85…

MALICIOUS

PDF

80.6 KB Created: 2021-09-21 21:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8f2dba1d15e6255d568a6fcfadc41431 SHA-1: 47ede44bab8e2987560167554aad12150ba68de8 SHA-256: b25eb54060880e85d2a2846d042dc4f612b44212f641d7bdb48b2f65eb5f24bd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based solely on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://houstoncoinclub.org/FCKeditor/file/91650179922.pdf In PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/gufifobupusolitevu.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/67668033534.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/bowobo.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/18113161142.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/79127182881.pdfIn PDF document text
    • http://ranchobg.com/img/file/sosawuruxipezilekuzovug.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/nazidevi.pdfIn PDF document text
    • http://allycatering.com/userfiles/61465658450.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614936113448f---ronilipata.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/6475140255.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/92729041090.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16146607b0e5fc---tatalisobox.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/56502869885.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/jedamivigo.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/a61521f2e92487852e8d2fcf18a4ca00/32824316823.pdfIn PDF document text
    • http://finchamauto.com/pics/talupedawuxajozifelazug.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/69227930892.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/27535169845.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=aplicativo+android+para+gravar+liga%C3%A7%C3%A3oPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/kovalibenaguxikubiduto.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_off0000d1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F6 19588 bytes
SHA-256: d8251af8d1696720a8714d36f35ff190bf93bf6a04994bedf6a8df87ab27d5fa
font_01_sfnt_off000102bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BC 10900 bytes
SHA-256: 342cd444e8ddef1c71ff3e5227e8d348a88deacce369df31c5dd643c775cab37
font_02_sfnt_off00011b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1