Malicious PDF — malware analysis report

Static analysis result for SHA-256 5405c2f45afc92ee…

MALICIOUS

PDF

73.0 KB Created: 2021-08-15 22:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9597493a2d090f8038cb04a3d3b5d853 SHA-1: 1db119ff4c5b8b2cbf70bcc104f181865230901c SHA-256: 5405c2f45afc92eefd6408b4183b1e3211c39b86e8bf032f3208a7464ed8021b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites, often initiated via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://imailbox.nl/images/uploadedimages/file/jomivu.pdf In PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/79298132361.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/tifetexaxofari.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/nubefepifujodezopogosugad.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3b39d2fb6---zeduramikodom.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/d54aa4da22ac1a64147bb50639aa6d29/fivarejuzudopilowek.pdfIn PDF document text
    • http://otczenacts.com/media/files/desawumivuvolikumi.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b62c1a1b68e---5448234967.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073a2f15721b---fisapofaruzit.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/neo9269qqssce34eq4nudcb8pl/51952560356.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/fizafisefalawufudenag.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/munugavororetekuwu.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/nakuxaritefogexeve.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3142e55b45---wakurojelufis.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/tomovexibetemigujirabazi.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/54425672342.pdfIn PDF document text
    • https://manenshop.com/upload/files/32526988816.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b9b47a70a---8340570055.pdfIn PDF document text
    • https://masukpt2.com/contents//files/vilitivakezumutuxepawap.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/11401411025.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-8-3/20210803064220680353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=word+problems+with+consecutive+integers+worksheet+1+answer+keyPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/jufimakili.pdfIn PDF document text
    • 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_off0000bdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CF 11604 bytes
SHA-256: 48578377f3a9cc05cff600626f905bb55f75e37f1e98616dd7e6cf1e90041a33
font_02_sfnt_off0000f0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E9 14880 bytes
SHA-256: 72afe88abaaa738e8feccdab18d72f9012559012b574f2f5efea746d972de82a

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