Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6150808d5f751c…

MALICIOUS

PDF

89.0 KB Created: 2021-07-05 00:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: aa69bb78e8c199968f75f7303e50a949 SHA-1: 9c40ce29e60d2414999b784265b2cac060e9a364 SHA-256: df6150808d5f751c81199582743f034b4a3db16be554716b434302ce1dc93f24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by both ML classification and ClamAV, indicating a phishing or trojan threat. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting sites, likely intended to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://agcslohian.com/userfiles/file/70500290978.pdf In PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/8ed5519dca606fc6c90901d7b5e47b57/13328454463.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/33476570440.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a4641899e52---30158603827.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/d19d7d6b8a17007e6af3abc9f6a222f5/11795094307.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/28732142202.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090c72fd5f4a---jezuxemugonotesagiwegaf.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210609023827_vg5w2k.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16086930184373---33151268701.pdfIn PDF document text
    • http://www.celso.org/download/43777265307.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d5ad2f73d---pabojebonekaxowevidije.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/23672738932.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946ed8948e2---femupox.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/fezegoxe.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa2307ce7e---2694003891.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082b09c6a668---jemizapogukufatas.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/sojutenozoxadurexiz.pdfIn PDF document text
    • https://kiameds.com/images/upload/files/kesuwud.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec3650b0ac---bumadiwaxugojunek.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/6c3525d1f688fa5333bc7531e216cfe4/vetifekedowukonudevimukup.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/kumarolava.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/botuxaputaz.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/11/file/20210511_105157_103.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/52992532308.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/98364717972.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7558c5cdf---xinuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=charlie+and+the+chocolate+factory+faith+jaquesPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e7dd5d456378f6995b8b61f64f0268f9/nosixikotekazujexud.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_off0000f6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFB 11096 bytes
SHA-256: e72d2e1cc27f05ca6fef59b55b048d7dde09b6d8c7d4f883544ac3666c462f68
font_02_sfnt_off00012895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12895 16736 bytes
SHA-256: e1a66db665b59c5666faf687f24a9e925ee6ca40516dda934e8421c080ffcd09

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