Malicious PDF — malware analysis report

Static analysis result for SHA-256 5443b227da7f84a3…

MALICIOUS

PDF

87.2 KB Created: 2021-08-04 01:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 530e91d003a90ace2ed81af89ad03af5 SHA-1: e98d28401e819f757fe1297f2458b79e06a3f37a SHA-256: 5443b227da7f84a33094b88ec785c5f9f5623ec3037afb92f8de11a817805c19
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with high confidence. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or link farms. The presence of JavaScript suggests an attempt to execute code, likely to redirect the user to malicious sites or download further payloads. The numerous links to potentially compromised WordPress sites and disposable hosting indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/e16a8a8a42e0884eb005f79ee34b9638/62112243440.pdf In PDF document text
    • https://luyenthitoeic.info/userfiles/file/xugax.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/wibibudu.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f49fe30c77---78334051487.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/wanadekeluv.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/53683171215.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/83da156976acaa0818bb0a6d0ff1e1e3/81785234096.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/pulipawibajotimetiwemolet.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/vusemepasepolejate.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/7207913144.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15ade88b9a---57670747000.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b8b0c836c---xitogog.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/42894692138.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4817c327f86ecc1983ab4efb0c5bb293/dijixaf.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/30173708018.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/5814c85c60c645a8625abd84716b06ae/31884479895.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/3748116878.pdfIn PDF document text
    • https://magerp.org/upload/files/zuleve.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/75d3c8d2dc555f337af5db1dcfc784d1/fubitituf.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/33497160838.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/948543581d225e6c4d7388e588587f47/tuzesuzemumipufor.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c48ac1ebe66---73123281724.pdfIn PDF document text
    • https://eurocomm-italia.com/file/80672660133.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ce653d108---vemerikutotajadezifatow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+connect+xfinity+remote+to+westinghouse+tvPDF 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_off0000f10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10C 11036 bytes
SHA-256: e1971df33b05b6ec95414a2af19ec8ff18305fd2157130dff58757a285db31e3
font_01_sfnt_off00010a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9B 16580 bytes
SHA-256: 41607d171e4c0a8c37a3fa5eb5324712461cbdd8cc420d1a85e288fbc7488da9
font_02_sfnt_off000135eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1