Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecdebd83c8de000f…

MALICIOUS

PDF

84.4 KB Created: 2021-09-06 06:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4af4587a425aa87701b68854245c3448 SHA-1: c5f52234e95ef2fce03655fbb551ce965e193a4d SHA-256: ecdebd83c8de000ff4ea1918a0673d3c65382c3067ed8c13348a32e2dccc8a50
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as link farms on disposable or potentially compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://anctools.com/ckfinder/userfiles/files/8997962420.pdf In PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/0f05bb829b650e06a23955e26132d5a4/misog.pdfIn PDF document text
    • http://benetalent.com/upload/files/geporipazij.pdfIn PDF document text
    • https://stvorki.ru/files/file/32594026909.pdfIn PDF document text
    • http://www.heksan.com.pl/file/kenamudalebilovowepinabo.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612a77d95e08e---mopet.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/rki774cuhiiouff03o0mmhun66/77360234613.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/jijapufexeputavi.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/30295873320.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/fegoxesavujepotiteda.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/20396493355.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/lewabovixezamenobezi.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/7489778113.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c10df1890---vikafimemekule.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/fezunegapozikodomezebizuw.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/97002179595.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f11e3eb7de---mogaxetiripinibova.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/38834423731.pdfIn PDF document text
    • https://iwistw.com/upload/files/zozitizupizozotuxodimire.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16115429f76702---48961110334.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/19dab11eebc0b56cbd5b4916475a7a2f/19839850346.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/bpqvaos51st2g7m24nh60k9agb/16911299991.pdfIn PDF document text
    • http://msiutilities.biz/documents/9909324224.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/kamirututabal.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/37506090507.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dacd0b283f---sizonugep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=curriculum+leadership+strategies+for+development+and+implementation+4th+edition+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_off0000e3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D5 11344 bytes
SHA-256: 9b16c27da37efe64f196632b88db80fed115d234153ac582843fa46856e359fb
font_01_sfnt_off0000fe37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11649 17084 bytes
SHA-256: 3f2db51aca1d5c827ca01814911559257996854364b9358044c84120811dd8f5