Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed3fadfb38b9d175…

MALICIOUS

PDF

79.7 KB Created: 2021-09-06 23:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4ec6ec081e201e1e23c2a9e25d104618 SHA-1: c6e46171210b9074b4e109a3b44bb7998c1aa7d1 SHA-256: ed3fadfb38b9d17560f67550d4ad83788d5ccff26b52585bffd76bf376bb8653
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 point to compromised CMS uploads or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://anjingliar2.com/contents//files/vurumivomugevotuvupula.pdf In PDF document text
    • http://www.wiz-fac.com/uploadImg/file/14404144515.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/1cab224da5edd337f21da83ac792cb35/72901895556.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8b6beeac4---gepelig.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/tu65h1nbcluu6g36v2to18bu4a/neduwusewabikagezil.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f2761056e---xobup.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160affb18760bd---48329265373.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/3c79bcc62cb1933082122c94bac90c5c/woludotewoso.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/suzaturawu.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/50176841966.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/63886489654.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d379ea40ed---lelose.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/6515701928.pdfIn PDF document text
    • https://everestart.com/images/stories/file/47312074713.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/boxejo.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/77157237931.pdfIn PDF document text
    • http://suurelepa.ee/data/file/1386386962.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/58888168326.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16121a1106c597---deref.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0a4b003dd---26489307382.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/39744331244.pdfIn PDF document text
    • https://telenovella-bg.com/files/64570875351.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdef50bd45d---21172908531.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/32be636d5bcfb43b46693a906927717a/71518407169.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/94299407906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=building+construction+plans+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_off0000d253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6A 10816 bytes
SHA-256: f3a4eccc97d70d6d692ff61e8c21ba24e613cd9a34dd482e36f743b67d85ecba
font_02_sfnt_off00010345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10345 17472 bytes
SHA-256: d71aabae9f3bda1e8cc2e6e9943d25054da7ed7f3d3beb4fdb1e9f415b5d3c59