Malicious PDF — malware analysis report

Static analysis result for SHA-256 506b3689b2ebf7d7…

MALICIOUS

PDF

79.2 KB Created: 2021-09-08 00:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eacc3e3afe90e55a82862a98ba8fb052 SHA-1: 4a2aff8ee0fe39c761a15c38bb07a5b23cd9f1d0 SHA-256: 506b3689b2ebf7d72be7c4b37d3553896f4870c50dd1d8f9e3d14d4febabf4b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm with numerous external URIs, many pointing to compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • 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://ppuhperspektywa.pl/files/edytor/file/38663656469.pdf In PDF document text
    • http://sarljarry.com/userfiles/file/lurowaxowiwoziso.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/pilonatupowutikunidi.pdfIn PDF document text
    • http://skia22.ru/pic/file/tanodovivuzub.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/5974631299.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202108022123587783.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/fikamemepikojowajobugew.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/8545628492.pdfIn PDF document text
    • http://canoeing.by/pics/files/47908615778.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/zodizagekimezinulagame.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/kijurobosaje.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a450e72cde3---51803360235.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/47332873149.pdfIn PDF document text
    • https://avela.md/userfiles/file/wubosapovolotowejil.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/zibunifamafa.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/80302869496.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/d6cfdc2586cced2f2606a0fefbdfc5e9/xuvadezugixunakoxikamoju.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa52d28b7bc---xalivamofanir.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/36299704017.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2f728868c---17895506867.pdfIn PDF document text
    • http://www.neocota.com/fckimages/file/xuvavaxikejabenaxilipajo.pdfIn PDF document text
    • http://leguido.net/files/lufuvot.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1611fcd990365c---86902652165.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/46298519027.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/wisuramurawewezawexuj.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/3ac7bc954b0080f9142cd8276bad9aea/denalogibiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=multiplying+and+dividing+powers+of+10+worksheetsPDF 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_off0000ccad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAD 18940 bytes
SHA-256: 628a7f680dcaef781e4eff3910c645388d1990fb31dc532259702f9e7c6ea33f
font_01_sfnt_off0000fbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEE 11404 bytes
SHA-256: 6e828fef71fca1f5fe5da01ee9f07789347b3f457d300e87f6c3ba9845b586e2
font_02_sfnt_off000116b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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