Malicious PDF — malware analysis report

Static analysis result for SHA-256 81186a953b058507…

MALICIOUS

PDF

181.0 KB Created: 2021-08-03 21:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7df241e6bf367e59ef362f1afb19146c SHA-1: 0d847cb41b2f7cffc053d73ad5c435ffcae3ef49 SHA-256: 81186a953b0585070f728d30abe7e50796cca00a38a4bee4822099a05d7b78bf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to various PDF files hosted on disposable domains and compromised CMS upload storage, suggesting an attempt to distribute malware. The presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://lesfeesdelhetre.fr/upload/files/supetagopokul.pdf In PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/nojomaxexipipazijexonu.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/dawigokatetaxinerasipisu.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/98704287228.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/021b3e1192d18d9b45f18cc5a3716da3/5691959152.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/12465615091.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/64128089308.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/fs3158ds0le9fbcgo9d5tcsa9r/birewiwu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d365abb49---ganigu.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/00f6c8cf61987c128effb4f45a38ee0e/80011639408.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/29903176002.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/c0a2b761d12601daf12c6f4841360385/96304297377.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/50965600362.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/fmr0qnpgnhv144atum5e2g1et5/47767149131.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/901750eb05dd8afe493f47e485c84434/29186803674.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/80384013889.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0d92e1e3def3128aed9c293cdab96465/xipomefisilerevumog.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/zemelixitupelek.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/fosesoxodug.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/bagaxitatuxekefurino.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086611109588---71820235983.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/b30ee07c22a656acfbaacbfa9dab307a/dipizuwerodadutosu.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/32871558581.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/33394366042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=el+increible+mundo+de+gumball+temporada+1+episodio+10PDF 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_off00025f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25F08 11252 bytes
SHA-256: c8b447387090abb5804d3d5e9b2d43941b277b6dd7ec196699012146ee29188f
font_01_sfnt_off000278fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x278FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002910f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2910F 19632 bytes
SHA-256: 9d1528326aea4a36c1705633f6099b36fecf2c288b80ae1107ff863df2e4b991

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