Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb68370d0e33578…

MALICIOUS

PDF

93.9 KB Created: 2021-07-31 14:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: da485e1398a3ca9720cdbd8b5aef7693 SHA-1: 6c8b010d0f1ade6446c62322b9778f03d587746c SHA-256: bfb68370d0e335789521761517ff201538a4d25783a0dc95cd33fde93417fa45
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting. These findings suggest the PDF is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d1584e1de---76434913062.pdf In PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a070f36987---8173723578.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/kujezatakiji.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/33327956930.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/h85veb5hlj0hsvpamgtdsaij5d/xubufizidenitipafarisiwo.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/tafojewesus.pdfIn PDF document text
    • https://service-panev.com/userfiles/91484984731.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/jujig.pdfIn PDF document text
    • http://citysuji.com/ckfinder/userfiles/files/pirupujifumeralop.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba70440134---janekubereworifonaxuvati.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/dasolaxazofugabidalinotan.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8071917a0---xutarebav.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ad62c49bc---58857362378.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd33306bbb4---1090653973.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/ponexaxar.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/nobiroxurigofa.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/46517454332.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/d93b54890d786dbd1b99eb88ad525141/pubagixanifalekanufebuxim.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/e791c3bc4584ab6e099a86022907bb23/58687355764.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/sivuwabo.pdfIn PDF document text
    • http://simpelms.nl/userfiles//files/68236507523.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/lowefu.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eb8be2e07---rogowevixanimusufas.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/d3e7850b797f4c33c0589dc5b20461e6/29790527501.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/7f0927e538aeda872ab6d01c1cbdb2aa/vakinidobukavetonefew.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210705_E9C65ED8E2F81A4B.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ship+incident+report+sample+letterPDF 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_off00010ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000122c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C5 17376 bytes
SHA-256: fd46abceb3c725cd57b310b9dfeab4997a455eed98c342bb96e5c1c47a6e7d70
font_02_sfnt_off00015066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15066 10852 bytes
SHA-256: 75313beadcf44c8a26d553fcafefc0d0ca605fe121fbf8e232e140344af20a42

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