Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d7691dc5314e99…

MALICIOUS

PDF

90.3 KB Created: 2021-07-23 00:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 71853da85accb1c1f45f2a5d915fa814 SHA-1: 5b95a1f19e2114896a92151dd62bf77c5690a552 SHA-256: 64d7691dc5314e99ad5704363c8b149f2fba11300c0ae0de08968302ef97b17f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by an ML classifier and contains numerous embedded URLs pointing to compromised CMS upload directories and other potentially malicious files. The structure suggests a link farm designed to redirect users to external resources, likely for further exploitation or malware delivery. No scripts were extracted, limiting the ability to determine specific execution methods beyond the initial document access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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://agmatbaa.com/upload/files/54260877502.pdf In PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/d77lja7lr2pechn66fqqp3huig/tazedeb.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095fd92807cd---47067868335.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/17292060667.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/firexa.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/36414804777.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/tawuwa.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bde09d323e3---gapesoxe.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/18372213970.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/betoponatizozepodor.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/texodarumiwal.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/pezil.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/ziludinulilexagabugusabel.pdfIn PDF document text
    • http://ezstreetautosales.com/clients/876244/File/88285289989.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ttlbp1t9t16sk0mava3e229071/79792170185.pdfIn PDF document text
    • https://migger.dk/userimages/file/16002471248.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/uo51f5l5nfnf3togs4iuq0brk8/24351840236.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210630130253_gxmeir.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/vezokijuroviruvujet.pdfIn PDF document text
    • https://chp-travel.ir/data/file/voraredotimadur.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/cd4thk7kqp2p0ri1lnjt073upv/zagugedusibekomubivip.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef709c1f6e---3956850102.pdfIn PDF document text
    • http://azizolace.cz/images/file/vivevezixixibeleleli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=which+one+does+not+belong+mathPDF 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_off0000fc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC80 17560 bytes
SHA-256: ad4b91c89c62a13046b2d6a599928904437c8c7793a913ba0f93f9a7589f21c4
font_01_sfnt_off00012a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14270 10848 bytes
SHA-256: d76865791dc24c03015f77aabe78cf4977985383e481c6aef337fa4b2696b2eb