Malicious PDF — malware analysis report

Static analysis result for SHA-256 e17e27893df766d5…

MALICIOUS

PDF

67.3 KB Created: 2021-09-28 23:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 65a520f135b932e262642a6c69ae075d SHA-1: 0e4117ba40d2013c860394b6e0380aafe98bf8bf SHA-256: e17e27893df766d580d2440f48acf8eaf676a3bcd4002d4211f4c1bb46a61a40
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised domains and disposable hosting. The document body is unreadable, but the presence of multiple links suggests an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://harckocsik.hu/userfiles/file/74744286154.pdf In PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/58851140960.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/39663217216.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/wowima.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d99104b03c---wisenobokurojibi.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/tesid.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/rujip.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/86702115682.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/zatafuwowojen.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/velofawonibivuge.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/bibogobulefi.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613933d637bd1---towodumeke.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/28891780902.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/98881851046.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/vunuxavupelufol.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b03f982fb---lovikunojijomojuwog.pdfIn PDF document text
    • http://hocomesun.com/upload/wozususokeloribor.pdfIn PDF document text
    • https://dom-titan.rs/files/90417465650.pdfIn PDF document text
    • http://jump360.co/upload/files/20210911054325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=blues+brothers+full+movie+streamPDF 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_off0000a97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA97C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC193 10732 bytes
SHA-256: d6b59140b40557ac8d813ab74f800ad888eafcde4847a433836aedc0f207892d
font_02_sfnt_off0000da54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA54 15060 bytes
SHA-256: 25a1f8346ca1ad6b6d91432757016960f71ea5b5d0349e0cbd14fdfb723b3af4