Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf10d3fa67e8fcc9…

MALICIOUS

PDF

77.6 KB Created: 2021-09-01 15:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf6d821f89c9b5cab84fef89052f27ad SHA-1: 88af4c71995ed1b6686febcb5ad13171cf856432 SHA-256: bf10d3fa67e8fcc923df4073059af2ea386911ae4333506822eeaf5600c756b8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely intended to lure users to phishing or malware distribution sites. The presence of multiple compromised CMS upload links further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://lesartsdansmonjardin.com/userfiles/file/20210531014836.pdf In PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a28a16a743f---19669058052.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf78bb2af3---vuminatakiti.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/5740e49483177885d3ce6012d6bdfc39/5878169682.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/189760192.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/7a0d80fbeba7253de2d9e4b5ad5acb12/vadebuz.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/witazesoforigipovasuxob.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/gumogafidetowokabovojes.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/cf3ddf1c9e977e14076f5148fcfb82f9/xofemijobiboguraj.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/30231256189.pdfIn PDF document text
    • http://allasclub.com/campannas/file/zovefuvufiba.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/melekemupadaxeg.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/xosujilusesosej.pdfIn PDF document text
    • http://jaht.com/userfiles/file/19326348427.pdfIn PDF document text
    • https://pasarantogel2.com/contents//files/10564688969.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/pilir.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/fusapomixamitexerisorixu.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/28698017178.pdfIn PDF document text
    • http://stl-hk.net/userfiles/fudorobugukulinabovom.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/6cfb2036c20fa431655d0e9028bed5fb/xifowofirewesi.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b492789aa---48705772445.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/putajabinetajuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=another+term+for+fashionistaPDF 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_off0000c363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC363 10416 bytes
SHA-256: 92b0a4425b96988dbf9fb1361e36ac62a289a126d87a367ac24c85f3ec76568e
font_01_sfnt_off0000dad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD2 20304 bytes
SHA-256: b49555b274f59b5f46e8f8e399c17cda202ba7ae23a768206feeb2ac5e683108
font_02_sfnt_off0001100e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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