Malicious PDF — malware analysis report

Static analysis result for SHA-256 b34117b3547d31eb…

MALICIOUS

PDF

83.1 KB Created: 2021-06-27 09:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 49fc2029e3abfef39c776fd66e84830d SHA-1: 81e9f8b656f2b4c1b2b07ff9c6c9445242b658f5 SHA-256: b34117b3547d31eb0cc5836e942e1bc288de6638c48b9024ac33c54f7d481133
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. The presence of a 'download button' lure further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://go2germany.ru/files/file/nadixoruzixejulunurewab.pdf In PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c950ca1f148---27258872761.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fa54d4653---36908260504.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/20cd50ca123cc4e9ccd6b97fc3938cf3/batanilununura.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6fb300237---wovemobebodozetoxed.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/9be00dbebdea7c6a545c448970284626/65349253352.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210510035614.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878dff167f6---40222338918.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/aoafr13h0ceb6lmol04585dv27/demamewujezusenatiwebeg.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bab4c77fd---60295911081.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160797f30840f3---rexerekevogav.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16098e0ec718d4---87057386432.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/53683171215.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/64936539793.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/f3b5b5d64640b1758b3b20559d8445d7/fozipufalexiripiru.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/xunidaxawitifibum.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///kunuluxipido.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bca35165329---dejabisenitexapo.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/33971507542.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be59170ffd8---marudizaruf.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/lph9rej6jspvbb1ukorfeihc68/57935522565.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/matun.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/53824383386.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/pedevaluwufimovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=design+of+analog+cmos+integrated+circuits+solution+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_off0000de06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE06 11064 bytes
SHA-256: 2d9825848ec64c39df2f8fb4b4097cb2aba4b198f074b34a573dfc7b9aff4ea7
font_01_sfnt_off0000f79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79A 17924 bytes
SHA-256: 7523dda4c7aa1e54fae4a90b37a0efce30bada5c6a822efb21dc67662f6442a4
font_02_sfnt_off000126d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1