Malicious PDF — malware analysis report

Static analysis result for SHA-256 15b59522712581ec…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 16:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 729e024fe6e4760e783a25487ed9c8c1 SHA-1: 9a4bf39b8b09242a3891b2917ff9da03cdd83a35 SHA-256: 15b59522712581ecf8b1854c008a22e2a13fbb5034669c3340607fda1aaf0dac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDF documents. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://calmoinc.com/upload/editor/file/jurutexilomopigupo.pdf In PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/bba89072d8c9532992985e1a4a1190ae/56211377066.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/masulupijejejuxe.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160865bf6ba188---32916113168.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/vunazunipumid.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/9114f40f3f3fcd50b14d9749d6016125/pafasevinasenabu.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/38007553227.pdfIn PDF document text
    • http://myphamasia.net/upload/files/43338803199.pdfIn PDF document text
    • http://goodmix-psc.com/userfiles/files/jugenavemodisas.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608826d355c04---71288833437.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d08f1957bc---zulebulefemezuzos.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d39a4311c6c---99742061895.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dd8e34e33---jipoxiganovubuzuxosaja.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/62966854800.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/51916964895.pdfIn PDF document text
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/tegenaxalutaforipedazi.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/vefamol.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/luwobiwukudesedikexaseri.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b048a93109---45661381010.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/22930055476.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/tavexizirutewiza.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/b44a8622eb0401fc3bb537afdba52781/46519433969.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16081a65e36245---38778665709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=mobiliserende+oefeningen+rug+pdfPDF 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_off0000e305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE305 10648 bytes
SHA-256: 34c285e4f64d414bbb9213a53f480b7f631f95fb4822a769b5e074bcdbfc75b4
font_01_sfnt_off0000fb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB08 17384 bytes
SHA-256: 4242d083578e2324a3ee01470c9f56c48076883641680348769430db0c2aa2ed
font_02_sfnt_off0001289e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.