Malicious PDF — malware analysis report

Static analysis result for SHA-256 436160c3fdce4ee7…

MALICIOUS

PDF

102.9 KB Created: 2021-08-04 20:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3b675d4fc0a04b8383a78c2b30cee701 SHA-1: 9464fe0714e0474ca1dd3d8f41735ad855f0486c SHA-256: 436160c3fdce4ee76b6f781f2bcfb468b0f2cf2591ef8de72e1f43721d68abad
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of compromised CMS upload links suggests an attempt to host or distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://morethancars.nl/uploads/edytor/file/4403389966.pdf In PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/wozidejexob.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16085a0ed55db6---gilutere.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1625763463.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/fezeredobi.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/rekixuxi.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/jomasoxituw.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/20759106826.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-7-9/20210709103514352119.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079334171155---jodesok.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/0811dd8a94f823cce68edaad25155534/duludukepedutazi.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac64dee696f---15716453745.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/76275142535.pdfIn PDF document text
    • http://jucal.es/images/file/29943189475.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/d93deb77b7ce5acb19cc327c16e78f75/widisodulotapisebavim.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/xizuvoneluboralereluxori.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/zozefuxigex.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/8b2143e82ff7d1b865846e8b959d8100/pexefedapusabaxozumivig.pdfIn PDF document text
    • http://bdn10.cz/files/file/natabikusibu.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/47334799641.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/54872796939.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/mifuzidubipuvovupivek.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/46bdfeaf52cc5e4830a4a9b4baaa9ca9/sipipegulafomejituxepelaw.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/cd721db0f7e67761f8054274e3efe520/tanofupugil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=norton+anthology+of+english+literature+volume+2+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11608 17812 bytes
SHA-256: 57d8a554361fadb907fbe1c18dab6a5b0155329715d640887034ec1107b8897e
font_01_sfnt_off0001445e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1445E 11324 bytes
SHA-256: 0d0b81b2e2a942db26196d317ba73653dc076b393fa2245259a5c8f3e266159c
font_02_sfnt_off00015ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EAD 16084 bytes
SHA-256: 629677e45faedee601e08dfe5d93bed8cb2cbab2933fb40e48fc5543807047de
font_03_sfnt_off000173e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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