Malicious PDF — malware analysis report

Static analysis result for SHA-256 135e66844ee2f51f…

MALICIOUS

PDF

73.0 KB Created: 2021-09-16 20:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c3595ea872e069251fe35c87398ed2c9 SHA-1: 1a1d09b991dae6ec81c608b06a778509ccde13b4 SHA-256: 135e66844ee2f51f6002de999e0692a2fcbec4aefcc0c216c4772a088dfaf6f4
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://jills.reviewz.eu/app/webroot/files/userfiles/files/60752380918.pdf In PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/pagadiputale.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/lijorowozuji.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/7a4c5f794c290cea1850f69e453b6cc3/ziwenoz.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fea09f319d---lafafekekefokewadugibelo.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/nukobakaxas.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/90965771351.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/3f7beb80fe0a2caab1ba279ef52accb1/33390586582.pdfIn PDF document text
    • http://leskovec.eu/files/file/novuroluzip.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b039251b5d---52487136313.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/99363004757.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/34483967030.pdfIn PDF document text
    • http://bptramptour.pl/files/file/talaviranusowuwanog.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/33106951911.pdfIn PDF document text
    • http://cartopack.com/Images/file/sexofebisixofiwuvif.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/86306867161.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/11e538721e3120bc984fabcb25813043/kefapabepubasovaxadow.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/26307838851.pdfPDF link annotation
    • http://belovosushi.ru/files/90216887760.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/vujeja.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/49766980194.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/s0jnclbgnr5ldsbkjgetahu6i9/76161943475.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f59d3e041c2c6478bdf2136f5f0b0061/44824854726.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/sawitixavowaluguxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=banjo+full+movie+watch+online+filmywapPDF 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_off0000b888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB888 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09F 11028 bytes
SHA-256: 22428d96ed6d428f9d9b69b81c6bc662e1bf597ef6caa0761964d0a0192099e3
font_02_sfnt_off0000ea23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA23 17124 bytes
SHA-256: a68a25ce8dd96c91858cdde27bdc337057df70d780e7b235e50fc963a5143f10