Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e865e5f4a9f936…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 21:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8329dda9e233436ded6b2120d5c4bad9 SHA-1: 838ffc26c36f62e449d9472030320dfc466b9f1e SHA-256: b3e865e5f4a9f936755f2ae0bc8a0457091af554c46e25db29e2cf8ca21c90be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous external URIs and link farms pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the nature of the heuristics indicate the PDF is likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=theodolite+surveying+problems+pdf PDF link annotation
    • https://lomasdelaweb.com/userfiles/2008.09/file/36313307396.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/qmqu833r23h123us2lc5vt938d/87554064238.pdfIn PDF document text
    • http://dentherapia.hu/files/file/rexelajopoxenivotetogo.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/e3bd02df67d7473f27282d7403cd00b7/54256746536.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/74903036715.pdfIn PDF document text
    • http://sparkpro.lv/content/file/80481073085.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160903fc57d574---29982941821.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/luvuzenavofidepamakom.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecd78d6b4d---wunagekopakadowigixerolam.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3818b94030---pefawegufujilibuwadi.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/nevarid.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/87dee67f5332f02add33b8475ec9daaf/40388686094.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfc3e793a6---sifubologuwixowo.pdfIn PDF document text
    • http://sungder.com/upload/68239853943.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608008ce9194b---rokejugenub.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073907663fb1---21536962567.pdfIn PDF document text
    • http://cecev.com/stockages/files/xawumoleforagisal.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7c79880e1---semajerumuzaxosirem.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/70941854085.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/fuvubijobomona.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/pusupifijiwowulazulop.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/6711962383.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fa04731b4cf---mivolu.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_off0000d812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF029 11164 bytes
SHA-256: eec12998896bf322364f7033898d5a429600a944b9cde392ccc67d883d62456c
font_02_sfnt_off000109a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A3 18068 bytes
SHA-256: efb9960d865ef4ea69056de72ad4bae9cb1451f9a255ea780bd7def08448e337

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