Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de0cc1995afdc98…

MALICIOUS

PDF

78.3 KB Created: 2021-09-10 09:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 736285a9bb9f75d465cf7e313135e578 SHA-1: 727185a3a660cba29a7c775143d0a8a208a4dfa6 SHA-256: 5de0cc1995afdc98ac673ded55a41708108527ae20e22aca6951dea2b13c412b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs that point to various websites, suggesting it functions as a link farm. These links are likely intended to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=racing+go+free+car+games+mod+apk PDF link annotation
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613188a442a79---8452123302.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///61366042902.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210902_D7328657C9A68028.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/63987309190.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/10909186165.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/losomifuwazaku.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/28284090998.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/c7abd7089385d8ce536c61d627817ade/jiwupinugilodijatimiwi.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/19036853292.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/lufevideli.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/nubel.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/98474631071.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/94593525625.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349d29bb3b4---42075703505.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/11056427671.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/aaa737a6090b9f9d24f17f4a5d3fff8e/mafajunevex.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210906231845.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/vuzilusewazufakewasora.pdfIn PDF document text
    • http://www.moyekolodin.com/files/vawezafoperujaka.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/dudalatuzobesapokat.pdfIn PDF document text
    • http://93564497.com/userfiles/29259474791.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/kapubulozigevilema.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/kagagexu.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_off0000c656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC656 19944 bytes
SHA-256: 2e05cdc11860eaa63a530e260695e635d5c6544289ba75746e79fa425e611a21
font_01_sfnt_off0000fa92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A9 10956 bytes
SHA-256: ff36e25bfd335a9d045070cd84c9aa7b8f611972de68717bdea5b2d6f0cd5d3f