Malicious PDF — malware analysis report

Static analysis result for SHA-256 74cbee12d59d0d96…

MALICIOUS

PDF

82.8 KB Created: 2021-09-14 02:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9c1d0e95f9e3ef435feabba24144db89 SHA-1: 072a5cc94d8cf958e1d91fe10acd5970b320c6fa SHA-256: 74cbee12d59d0d9689d1f721924c4b87a8b29676cd4e9860bf092de07cbb59f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lobanowscy.pl/userfiles/file/3015663976.pdf In PDF document text
    • http://divapharma.com/uploaded/file/vofadanabumebene.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/wasaletoninagilanuz.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/67930982715.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdc8bde936---92422890534.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/b8f4675b13eebb7aca3dc1045a42d38a/37777516139.pdfIn PDF document text
    • https://lesura.net/userfiles/file/78216136169.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/zumunufezufutesizunodesi.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/46189890390.pdfIn PDF document text
    • https://aksusu.com/upload/files/25501330863.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/55100626476.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/doxejedunabakasezewolevat.pdfIn PDF document text
    • https://asiapharma.la/files/files/fetikigevakuzujeb.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/55132857862.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210906_222627.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/gitorapaf.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/jufamaguvirasajig.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/m6g3lr35eftu5hfif6ji3hlpfo/72338576078.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/xomopekilin.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/13340339214.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/23388513707.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/41697643862.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/bilon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=date+format+in+androidPDF 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_off0000df88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF88 18012 bytes
SHA-256: 832ef25cb0de230d4f0de9efb09540ce8ff35c63cd869fddce9bfe466a833be0
font_01_sfnt_off00010ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBD 10300 bytes
SHA-256: d8706d89342f6e1a05b1035ce5d98c2eccf07fa31c1a82b732f5f9d43c742f4c
font_02_sfnt_off000125ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1