Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d390c6fe6f7e4a…

MALICIOUS

PDF

93.0 KB Created: 2021-08-05 05:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: be485c21ed0b9d175c9a01fa72f27519 SHA-1: 2e8647229aed4812fbf38516db7d83dff9bd5415 SHA-256: 87d390c6fe6f7e4a943f4ef2c30c3df4ab0a3a762c20aeef3dca266a6fc5c5aa
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, particularly those hosted on 'formcraft' plugin directories, suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080f76346572---43037624076.pdf In PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070a0eceeae5---55744565005.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a93fa675d92---56709556491.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/gadadirumezuvatujom.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6a4e516ef---tusal.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/1778060645.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ba125c5aec0---rogoregupoverafatef.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/sabuk.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/707056159.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/rewozi.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/41481314509.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/77021673746a43e51791beb21612423c/39537189703.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/rojejinosazo.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/dudazenekupipakerekinom.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/8e7e77f101024902d0dcce0eb1ec2aad/dufawexiwipomutu.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/fitadimobajar.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/f9bfc757816f62b7132622c4d29d9e4d/mufinuzozupuwivaw.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/xegamedejawefefili.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/c1b6f45d8d1a48086b701ba796543cda/67318684348.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/xefeguzudiwukoselerax.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d3ddd4668---kubugor.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/78693132130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+do+i+get+pdfs+to+open+in+chromePDF 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_off000106cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDE 16780 bytes
SHA-256: efc13207579ec1551581afe159982a15c5491b1abde83e8838b903a79afb4339
font_02_sfnt_off00014a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A81 10936 bytes
SHA-256: b54a585648fad9c0b3f6459ff97aec64d54fac976d185415090b91fc61c4dd81