Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bfe4e9d07d5d0b5…

MALICIOUS

PDF

72.6 KB Created: 2021-09-15 11:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 35ec10d9a454b6b5cf8152a2c3952423 SHA-1: 83269de41ef77e5380dccdf48b208bb3fbc2dd63 SHA-256: 4bfe4e9d07d5d0b5814e9228c246d082beffac013c42e7a8b57537e22c9413e0
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to other PDF files, many hosted on compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://drafthe.ru/uplcv?utm_term=jumanji+hollywood+full+movie PDF link annotation
    • http://alda.pl/ckfinder/userfiles/files/49027603865.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/sajozol.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/87700275792.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/52143711729.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/jimebomobojadiwikab.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/lowuve.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161417759847e1---37959458413.pdfIn PDF document text
    • https://ibextrail.com/editor-images/25974199185.pdfIn PDF document text
    • http://mp-journal.com/media/file/nigipopogotonopikedi.pdfIn PDF document text
    • https://foulardfotografando.it/file/xunekopotobudegedijik.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132856eb737d---natupesegivebonubusini.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/vewupolezekexobabomajelor.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/34faaafe6d38c65f3c822798c3b2ac78/1448279754.pdfIn PDF document text
    • https://equalland.com/uploads/File/zebowawobanifipupov.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/48978455373.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320d5a35905---jobulolimatiteg.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161318607a9889---72045225048.pdfIn PDF document text
    • https://chineseclothingonline.com/File/mufikiwurevaguduxu.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0849b0f7c---zopanuninezipoxepafukup.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/35624236244.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/68623224064.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/56938872043.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_off0000bb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB76 10740 bytes
SHA-256: a0a153e99fd518282a9e9a60d0c606be44a339c388f4b5778eab74c51502516d
font_01_sfnt_off0000d3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E6 16008 bytes
SHA-256: 1f212d944e99cf33103cc95a65a9955971ec657510fa792b9585978d97e98c86
font_02_sfnt_off0000fcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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