Malicious PDF — malware analysis report

Static analysis result for SHA-256 8876bbd22f2abb20…

MALICIOUS

PDF

79.4 KB Created: 2021-09-03 17:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c942ea807fc88fe9b364a1a5ca0ef15f SHA-1: c0fd4a74d933849ff6953def1b9a52ae4ea16de8 SHA-256: 8876bbd22f2abb2062ce3be64578033143a002ab9f757c859e658d3c6f62124c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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. The heuristics indicate the PDF functions as a link farm, directing users to compromised WordPress sites and other disposable hosting domains, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external URIs and the nature of the heuristics strongly suggest an attempt to exploit users through malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://medvor.ru/uplcv?utm_term=jurnal+pertumbuhan+ekonomi+malaysia+pdf PDF link annotation
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/06fff46508b2c26837561de564fd6089/nipaniz.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/23527877346.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/63499887189.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/mafupovapalexupad.pdfIn PDF document text
    • http://ladue62.com/clients/2/2d/2d0487a90c18d3a1b3df44839405a665/File/58121650872.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/89928034945.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/serokel.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210703004307_msd670.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/fodagavusogapiwufibaka.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/807c32a1e911822932d823ff7d8fbe08/22598397040.pdfIn PDF document text
    • http://prof-cosmetics.com/upload/files/91049712671.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/30642589555.pdfIn PDF document text
    • http://cocoal.com/uploads/file/65880767736.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071f6c4a99e1---57915254477.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cae6ddedfb---90751326027.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/80028466742.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/87i1qtl9mtaf11hkfdvjvis804/60599505657.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/77512452907.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/jaxazejagev.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/gezilaxikuxuxuganew.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/79323961535.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1611b785d1b45e---winowabekamene.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/64448394633.pdfIn PDF document text
    • https://ferropula.hr/files/67441743699.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160843989df946---73642062318.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/pruo2bp0k6ef2b6j6la5u2q5e6/81291706445.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161140cb34d779---tabadobamu.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_off0000cfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE4 11200 bytes
SHA-256: ae7fafdd14062db3f6cd71bb81cc94b43c6c5f35e8e4bdb0f848ed00bb73fe6e
font_01_sfnt_off0000e9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C3 17652 bytes
SHA-256: 41999321ec290da22c005d01e83affd87c07e3383978c6143c0b07976776fce9

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