Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2482afcb06dfa7c…

MALICIOUS

PDF

75.7 KB Created: 2021-10-02 15:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0c11500da3155eb2e5e53a8e29cc36f0 SHA-1: ca44723461b83aee1304d424b57a8fc6f0bc7031 SHA-256: a2482afcb06dfa7c7c50f1de67d3f18c7a57b2e80f7d6a57a6c26dad303edd8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://plaschke-partner.com/uploaded/file/84219137499.pdf In PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/98063964903.pdfIn PDF document text
    • http://www.ximangsongthao.com/app/webroot/uploads/files/kixalumujaxoduziged.pdfIn PDF document text
    • http://leruichem.com/upload/files/fuwete.pdfIn PDF document text
    • https://bfull.ru/uploads/files/80614261338.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/70864750326.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/85189412520.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137b78cd54c7---29796063025.pdfIn PDF document text
    • http://benly-carson.com/product/files/77124767685.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/fevajuxeluxaronisukoxolo.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/zezogis.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/nifotujir.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/poronevoxazizem.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146612e26a60---29865390882.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210926193411_1007696707.pdfIn PDF document text
    • https://stormester.no/files/file/37808003769.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317452d8f36---43895143175.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/1572408712.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/88856044973.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6994a9687---19200105591.pdfIn PDF document text
    • https://hirurgija.me/files/wirom.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/48354186537.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/29e62a57b2bcf4a14045df2f5ff5a8f7/lufuboledavukikowebis.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/rekebodepetevojureju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=tracheary+elements+of+xylemPDF 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_off0000bef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF4 18912 bytes
SHA-256: 3d464aa9e7f781beec3749fe941647ad0fba332977848214bcd4075b9d880c73
font_01_sfnt_off0000f04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04A 10688 bytes
SHA-256: 5a637878d2b9887d061aa3fc50cd3f1b148278f2017ff1f38ce86a9a82bf1134
font_02_sfnt_off000108b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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