Malicious PDF — malware analysis report

Static analysis result for SHA-256 d379b03e951f7753…

MALICIOUS

PDF

79.8 KB Created: 2021-10-09 22:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3ea7c2d13cde428d04218c4bac0d752e SHA-1: 196575eb97dcf4649336f5fe6926f5fd95a884f1 SHA-256: d379b03e951f775320f9a9ca4fe7f3ac7847525c7ad9f94be17d9dd83b15d523
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farm heuristics strongly suggests the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://huntic.ru/uplcv?utm_term=career+change+objective+statement+examples PDF link annotation
    • http://tzsunup.com/upload/98069210676.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/33223759696.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/sadifusajamivakos.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/50761951255.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1615af58586c19---lasir.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161337ffab2e59---sabatusu.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/67909214107.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/7716655161.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/6938717202.pdfIn PDF document text
    • http://autoescuelatosal.com/galeria/files/tupew.pdfIn PDF document text
    • http://ucokampen.com/media/files/rominuzezimobilenu.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/lufopugijagibilurafeku.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/gikidepefo.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/53205602579.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/gefidukekuxewuj.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/runebedatowedebomegoran.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/xivug.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/soxekogamawi.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161613b805dc6b---35503466696.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/fdd59295e41f41d525c1c437bd2c8d02/12423477281.pdfIn PDF document text
    • https://migger.dk/userimages/file/mafamaxalisaw.pdfIn PDF document text
    • http://headrepublic.pl/images/files/4528983305.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/15815523125.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/sisolebufow.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/kebovoxunan.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/nilobenunuxafarukuj.pdfIn PDF document text
    • 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_off0000d34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34B 11288 bytes
SHA-256: 30a78fff62fc56ee41de46c228851805a932d0e96ab814fe3bb5851184fed85c
font_01_sfnt_off0000ed6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10580 17268 bytes
SHA-256: 7139e1cf985b2bef44624e2b95e2f20f6c76d7e80cf766dd79fc4713c141f75e

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