Malicious PDF — malware analysis report

Static analysis result for SHA-256 c543d6b5de9e568e…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 22:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 896cd12d34d6746d8a26d8484c8d3657 SHA-1: 8b5a0a577ac9a67bb34ecb655eccad6018eabbbf SHA-256: c543d6b5de9e568e09e1127fcfbc907f1994bd43751a782874edf427e90ad931
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external links, many pointing to compromised websites or disposable hosting, suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://scuderieverdina.it/scuderia/userfiles/file/82891673026.pdf In PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/32124816894.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/34940370260.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/30eb4574d82266ecc697af52053e24bd/wujusasofavaxinir.pdfIn PDF document text
    • http://montesantangelo.it/files/files/20605852989.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/77968823100.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9d9b6c9b7---zizalalebitoxuxibipavonol.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/20862571791.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/76836607478.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/jadefesijajokesasonaveb.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139de80693cc---baxulebigi.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/96437931135.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/91879382382.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/65918145314.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/25441075536.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/xeletokanowijewokidozu.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/39456754914.pdfIn PDF document text
    • https://angem.fr/userfiles/file/51357287405.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/desol.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/pupewobofexe.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/99857322673.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/loporamipuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=darani+jithani+song+downloadPDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/damodivug.pdfIn PDF document text
    • 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_off0000dc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC29 18248 bytes
SHA-256: d0d004721ec821982f4983d094cfc0b2b6a40475fd0bf0d77c3ef6ef7814fdd1
font_01_sfnt_off00010bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAD 10612 bytes
SHA-256: 1ea625b7ccd8ac5691f4b7193268e2d4941555c3dd32222f4bdd205249e132b0
font_02_sfnt_off0001239e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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