Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa61e2bbc717b054…

MALICIOUS

PDF

81.8 KB Created: 2021-09-11 18:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e2aa7efeb2c2ab6ff278aa15a7decdd7 SHA-1: 122ae6c8ba17ed0e2bff7eecb5dd640c4121f4bc SHA-256: aa61e2bbc717b0547e3ffbff510ba87de8b3c6905b77362fb5b87a9f215f8650
156 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://allaboutdowney.com/userimages/13790163828.pdf In PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/melisitunevegoli.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/49708097317.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/zonok.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/53496009040.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/73347912034.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/39698388834.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f21f8a74e---zitekib.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/20738490092.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/21481911100.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/80671029369.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131d7e068859---tatime.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/wunajeb.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/30c5a4a9b3f4b72352c0dc4731dac34b/7291892745.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135b2383aba7---96410159422.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/zudinijojus.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/kijew.pdfIn PDF document text
    • http://gro-felix.si/uploads/55030555677.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/tunirigumazogavamaximeto.pdfIn PDF document text
    • http://hanleyresources.com/images/78267414378.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/62611140091.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/vunokagiziralam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=android+file+transfer+not+working+on+macbook+proPDF 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_off0000d868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD868 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07A 18164 bytes
SHA-256: c322c46c560d58ddb4aecc6b989d02d8f42a75931c02c97ff0fbbbd2109d7bbf
font_02_sfnt_off00011faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAF 11260 bytes
SHA-256: f52a79db1b462a3227ebac0f9fb0bb0fb8ee0c85145729b1dff2584220ac8614