Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3261cba7f99e019…

MALICIOUS

PDF

74.9 KB Created: 2021-09-02 15:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1fb5dc0a22e120f58ffbd4061825e573 SHA-1: b938575e82b35d409cf521047a16d80ab3c84e9c SHA-256: d3261cba7f99e019a9967d30a5760f962cd98cc2dc2b093a3782cab47d301caf
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to distribute further malware. The primary function appears to be acting as a link farm to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://carparts-fixture.com/file/file/52694761802.pdf In PDF document text
    • http://say-international.eu/userfiles/file/zedafikimekuguxu.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/34614919688.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/nefimeruliwagiluvuvorodi.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/99218611415.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/39dc04203b3eb9ba22cfbebc7aadddbb/nabavekazomuda.pdfIn PDF document text
    • http://fedoro.ru/upload/file/zubamivefugujukinaja.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d5a3b25c2---fodejemoxokazulubowevu.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/rilodos.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/966da0b546ba68113337a4954935c412/pogupazopubakun.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/19222030089.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/87392198316.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1611508528c8ac---xenajawago.pdfIn PDF document text
    • http://riversedgefm.com/files/file/sobefofetolezeso.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4b46835a6---gofufovumomi.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/rirujazosekuwaxixovati.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/37814814684.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc6d23e04a---77634195752.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7e9562596---gujapomoso.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/jasusojadufonejinutafo.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/nozux.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a247581066---91511968972.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfd61dade6---duzidaluv.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/5122d894cfa76a46f9b176b8e7c51b1c/66694908258.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/60420307129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=soil+and+water+conservation+manual+pdfPDF 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_off0000c05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05B 11108 bytes
SHA-256: d73b1351f3e44ac833424639da57427ace9dc71af605589767083560d64eb1e2
font_01_sfnt_off0000da47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA47 16888 bytes
SHA-256: 2b51da81e2ac6c3fb60d935936c0d18001c2aaaeb60fa61b1231390f191d1902
font_02_sfnt_off00010577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1