Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bde84029841da9c…

MALICIOUS

PDF

100.9 KB Created: 2021-08-12 19:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7266a00f9a78f6bf41e09665ca45166a SHA-1: ad389c8a84bbb7ae6300950f070ca1a0bde81165 SHA-256: 9bde84029841da9c9fc4fd6d94f023557759ddde1de5cb71d00430d7eee0b2bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=a+primer+for+the+mathematics+of+financial+engineering+solutions+pdf PDF link annotation
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/go1lo2m7imhgnn7n8hru591idb/76437712266.pdfIn PDF document text
    • https://isosklo.cz./uploads/57790635388.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/vigodavemetusifadazu.pdfIn PDF document text
    • https://12shio3.com/contents//files/nuxonewib.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/3967bcd7f2c09beb9ddc4376c691c399/91182818674.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e2dd5c13c---57941822803.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/16083032013.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3fc87b657b---58379242465.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ura3qmdbq9o3im0m73uegm3aj8/23183928762.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/lutitikudegajopag.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb15ecc7d6---fukuzofol.pdfIn PDF document text
    • https://belloverde.net/emailer/file/duxogumud.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/rerekimemubove.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/8e36e84223c634b1a1ccbfd8052aa41c/dofitemiba.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e3134e8702c---63195328152.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/15609256892.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160851be22703b---2344920715.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd48c62e33---26631393321.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/21748316308.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/viwosexax.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7ebf3b3d61a8f832767dc3adad5af3ea/11415063568.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/8914161480.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/67472125062.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_off00011fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC0 11148 bytes
SHA-256: 7234f0e5961163c6587339cb8020549c682be8a2cc2b09d23721612cf90c6706
font_01_sfnt_off00013967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13967 18836 bytes
SHA-256: a3274e5dbb22ea5fd11bc95b8cc2741b0d7c06ffbd3520658894b809c16fd4d6
font_02_sfnt_off00016a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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