Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ee4d380af4b1dc…

MALICIOUS

PDF

197.3 KB Created: 2021-07-13 16:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 57ba71a9b56b390b9a6fb7ef68f0f751 SHA-1: 921be906c77f9d526156bd15d20f6ae3c6670d7d SHA-256: 72ee4d380af4b1dcf6064ee09eabaa950affe47cdb8e5be54b9f72cd92345cfe
166 Risk Score

Malware Insights

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

The sample is a PDF document that exhibits characteristics of a Business Email Compromise (BEC) attack, specifically a payment redirection lure. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting an attempt to host malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9821

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • 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://richwoods1969.com/clients/861079/File/77684612755.pdf In PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/suvuwavuzedusavofuwofim.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/7db11369ed4cf78c8ea8a8337940a0ec/90935679682.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606e85307afdc---9436612163.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/7c629402411d56960d79c0e8a4c553d1/pubezufimanibuzif.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/xakosegewipa.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/97038844597.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/8796d14d47f576502d1d7fa936e0f514/dafovarewulinomeluxavup.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/47163128440.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/f9d6e994c2d40d6a71874b6a7d77280b/lidevuwetenivotuta.pdfIn PDF document text
    • http://thepdaitruongphat.com/upload/ck/files/35711397383.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-13/images/files/19705016294.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/60881909118.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd738d9c836---85533233160.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/keteke.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/vunigumojipalosenawekoj.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/19955261319.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb0362d9ed---33056413053.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/lopisunafazagufupekome.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/waxamaminenemebadir.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/bddbfd3e828a5458332517ccf511fd4d/59321836440.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/95606274798.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/5r9th4dcto0lmhe85oap971uoa/sejezugoridafamafupesepif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=functional+group+interconversion+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_off00029900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002b112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B112 23740 bytes
SHA-256: a8c2a4d2b9816314d90c53150c2f17ca0c43b8e4bf3d8db7476d8978f972a56c
font_02_sfnt_off0002edaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EDAA 10936 bytes
SHA-256: ab2bae9b229ba752ef583a5e8343f5a49532139d6ce8603ac5ea8c4798be621c

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