Malicious PDF — malware analysis report

Static analysis result for SHA-256 d820d2386b3c9df7…

MALICIOUS

PDF

86.0 KB Created: 2021-06-26 03:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8cec9083a9ff1c825bc5c0da7f4e5e41 SHA-1: 622a6a10cca5c477a203cf406e08954cd94c5352 SHA-256: d820d2386b3c9df74357fd7f5eb5bf5216a9484c8fe00d220448c57942ace0cd
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm or phishing lure. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV detection further confirms its malicious nature, classifying it as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160881df5da0a4---63792733729.pdf In PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082323c10cab---1612432993.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2f79c0adf---76579472506.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c13209ebaa3---48247729066.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/wepelalofazimowomisisebo.pdfIn PDF document text
    • http://santeh.md/img/files/zevotizibafexalaguzefudo.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/93338133523.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607478ac5673f---rizokoberata.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/madewubigekefup.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724362f130d---70338818138.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021062300170511.pdfIn PDF document text
    • http://budka39.ru/files/pepiz.pdfIn PDF document text
    • https://zold-kommando.hu/files/vuwujumemokuf.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/11389875821.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/5ba1acttmo9off3s8bo53h2ap1/62218191244.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072139b17d1b---68961768117.pdfIn PDF document text
    • https://nada70.org/userfiles/file/37098399984.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/85488583020.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/de0a200d4804b28e491fd31b13dc56f6/56559976341.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b98dbe2e83a---raxebusojudividomuxodet.pdfIn PDF document text
    • http://haphadoor.com/upload/files/nogeb.pdfIn PDF document text
    • http://dzbnf.com/upload/file///24584975924.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/jifipajinoxotuberobaru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=michael+and+janet+jacksonPDF 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_off0000edec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEC 10584 bytes
SHA-256: 8c94ec5b34798f3a985e69b4a5eae8a583dc4a1041b22aeb06dba41cb3295cba
font_01_sfnt_off00010602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10602 17260 bytes
SHA-256: 30568508eac5e4ac3576af310e80314043e989499d2cb373d484f052bb7116ba
font_02_sfnt_off00013308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13308 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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