Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf7c7ff43547455…

MALICIOUS

PDF

87.2 KB Created: 2021-07-09 16:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d9a3c80e3ac8e378cb9d07b07a0b616 SHA-1: 8f6105e21b03546f7766e91f24e4664abb91cdf3 SHA-256: ccf7c7ff435474555b588c91d16abb01b1ddfa394ff68b5ce479902a323de8cd
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains. These links likely serve as lures for phishing or to download further malicious content.

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://oniceh.ru/uplcv?utm_term=pure+water+business+plan+pdf
    • http://dostavkaturov.ru/files/file/xekanexe.pdf
    • http://asustainable.com/global/file/sanuwumaxitunu.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a6157f64499---11443516427.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a28c469f11d---zidafijor.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082369081995---gidasuxogijefona.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b2358e05810---towupoxoxojog.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/6113oss4vhgesqejg6ro4aqstl/28501144039.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/b5a93d60610e122705dbc1dfe46d157e/fabifudivujiwewekar.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/5e1d97a03b5304edffa88fbe2306242d/xulemewezutegom.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607284308b51d---kozebigexikosomivug.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/e5n3ttgklci9jfmc3ljvjulfs9/xakixis.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9a27bc3fc---85028578549.pdf
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/86403476895.pdf
    • https://motelandratecuci.ro/userfiles/file/66757513983.pdf
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/93964118393.pdf
    • http://braciszewska-klimek.pl/fck_files/file/raxatetexibefeririv.pdf
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/170962960.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc17c781e1---21673642473.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd4479fe47---63927800745.pdf
    • http://alnadaoil.com/userfiles/file/korax.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/6573c3897a115fcdfd2606f8241605ff/monekesutufekolujapod.pdf
    • http://a9188.com/upload_files/art_files/files/20210621_022757.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8e5160c92---sezukudiwixudonulu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f38f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF38F 16792 bytes
font_01_sfnt_off00010ba6.bin
39cc8c9d30236474806ae301ca8a2630a1b26e3dbda12edb5313777e620019cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA6 10696 bytes
font_02_sfnt_off00012420.bin
40a4c8cbb476b6fa030325387a37c2f86a580ce104320a03191beb21dca39cb5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12420 16844 bytes