Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8bbb0176813a8bb…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 08:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: be5a044a8b4d2e50add46bd80744aa6d SHA-1: 920b6b876d70f7465d466b63ea73e51f7404f31b SHA-256: c8bbb0176813a8bbcc16dadfe572f68bcb9c680f98a0a7b48e819869c33af072
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted from this sample, but the presence of multiple external URIs and the overall structure indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://klawiatury-foliowe.pl/_data/file/vezine.pdf In PDF document text
    • https://abugfreemind.com/userfiles/file/jewepi.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/pizevez.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/mozotefanedogejovuwe.pdfIn PDF document text
    • https://eubeer.vn/uploads/files/kegugusoselubajune.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609457555d297---11894680784.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/89852243090.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/metiramunawopefegezog.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/e6a0bc116e58341f1d57b776da69ba2f/jelukevo.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/marajipi.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/69377299854.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/mogonum.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-7/20210907171923291519.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/63508135796.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/velibalepotu.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e93fc27218c---lulimugug.pdfIn PDF document text
    • http://teledirk.com/d/files/zoxuguref.pdfIn PDF document text
    • http://short-story.ru/upload/file/wiruturedoki.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/19497591060.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/49274480814.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/robafilunedim.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a671988bd52535b2c39f66f0610a5656/selafigotafosador.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/fc1f0dc7d19e59378cf5f3ed53bfc449/78530794842.pdfIn PDF document text
    • https://ienter.bg/files/9005234770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=character+development+sheet+pdfPDF 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_off0000d8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EE 17684 bytes
SHA-256: a2e55ac6c34aeb7ffd1ae693c318a4873ab19cc4108478e95e359e297d702988
font_01_sfnt_off000106b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC9 10892 bytes
SHA-256: f1ad64fedd8434fe85adf5239c20e9640dba87e851124e80389e440e4b8e1437

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