Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2d579e68b40811a…

MALICIOUS

PDF

67.9 KB Created: 2021-09-19 05:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7e6eb85c339c968d95cde96aab9eaddc SHA-1: d217f9325965f092c98c2a4f058c3d7d91783f0a SHA-256: e2d579e68b40811afacb9a0763191af81407fb97220b798c9f18d745eee0b9ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://phongkhamthienhoa.org/images/files/wonedujagupupikukarug.pdf In PDF document text
    • http://lg-palette.com/upload/files/26020576115.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/wugakuxagilukupaw.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/13857441495.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/81224972616.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109062051373946.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/65cbc68b75941e59fcaa313c1b8a44b6/pexinowezamavevidanepu.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/samagososobivak.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e7ef390e5---duwuzojikosurimuvokatov.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210914_175756.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/80313317481.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/pugipubimeweko.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/5080560259.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301972d0e35---3452043199.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/guverotexisa.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/fotapevuzeku.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/39597621146.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/97626052802.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/wolexetitata.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///mexuzokedefotonudepe.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/nimenone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=flirtymania+apk+modPDF link annotation
    • http://irodori.kir.jp/files/file/pekopiper.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_off0000ad93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD93 10436 bytes
SHA-256: 3596517e865f0b5d7a2bdbdd6447304989781f7ed7c7ba960cab2e6808e9c18d
font_01_sfnt_off0000c52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3C 14808 bytes
SHA-256: c00227b7412bbdd7036c41d57a4cc3ffa6a788f8568db3f448be1be14674622d