Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa280887a7f861e…

MALICIOUS

PDF

73.3 KB Created: 2021-09-21 04:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7b0f194fc94d3d00ed64441cff904435 SHA-1: 7b712348cb1d3ede1bc58a0ea4d1401679d83a7e SHA-256: ffa280887a7f861e77a5fe6762bb843a0d0303a44db8e32da99764fa53b3eff4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS upload storage, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution, disguised as game-related downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.iece.in/userfiles/file/43202943657.pdf In PDF document text
    • http://tieulongcopro.com/luutru/files/88856711551.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/9829769680.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/tesizinubutosawuvuvopodo.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/wizove.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/58376680917.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/217071907.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/danudonivebo.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/81131044907.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/73634627411.pdfIn PDF document text
    • http://northcity.rs/slike/files/42201517706.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/ratonu.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/42578421358.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210919180538.pdfIn PDF document text
    • http://espokebar.com/uploads/files/zugewolewomobizepiniza.pdfIn PDF document text
    • https://find-domain.lazy-online-shop.com/app/webroot/userfiles/files/gujamomazixonanivur.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-14/images/files/vagowu.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/d3c3f0f7c0d3122def32c28a20023f48/wivof.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131f94cf2d5e---xopomasiban.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d162e3b5d6---30342106065.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/webune.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/mewesuzexafuduwapofafo.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613511806C5F1.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/virowotikide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=among+us+all+skins+hack+apkPDF link annotation
    • 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_off0000bf2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2B 10664 bytes
SHA-256: 671c254cce25be944094aeb467c24ac89044b239b16d3433614200e98972676f
font_01_sfnt_off0000d76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF80 15668 bytes
SHA-256: cc289a45e908cb4bf2571ea39f742ea7b61d4d18238d2d13a0bfcd7752d33a52