Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b1996b126c4f1e…

MALICIOUS

PDF

81.0 KB Created: 2021-09-20 01:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3708378854a26d6df827b24de9ca8a94 SHA-1: 14790ab1e94f04c137aac171cd8d95c77c5c3e5a SHA-256: c5b1996b126c4f1e76628cc07641e418f8425e64903684957a1cf94a10893452
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various domains, some of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://danielstrehlau.com/userfiles/file/muligisitopuw.pdf In PDF document text
    • http://swaminarayangm.org/userfiles/file/54861360971.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/46724145184.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/46296804687.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/fetabovuvepudoxabifanev.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16133d131201dc---bapupagilesutimeronexepaf.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210905175729.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/mevuv.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140dd4f94ba2---depefusadama.pdfIn PDF document text
    • http://xn--80adib9cjd8a5e.xn--p1ai/i/upload/files/tubunomovapimezutekoje.pdfIn PDF document text
    • https://ferropula.hr/files/37606591486.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/15194816578.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161311fe4c4785---nixomegogigebadamugi.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/zaredijinujufetotavumus.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/27362946747.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8b8ce6dc2---38103242778.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/xamokowemuketuxonu.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/mawoke.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/jixukurogotesoxigujo.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/c75a072fe6cbcf21ae03027515fe68c9/ripafizajadugobubateri.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/gopomawimamakaxofi.pdfIn PDF document text
    • https://aksusu.com/upload/files/wibepamibarotumuduti.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/17272897019.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16147b011be92b---tumivaxusorojoxiles.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/356bd29ab906331ecb0b6a27983f2bb9/96332440965.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/lebetutotim.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/97472686229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=go+goa+gone+full+movie+with+english+subtitlesPDF 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_off0000d47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47C 10992 bytes
SHA-256: 369297c6dad3ebcd29d6eb3ff0a0bf2d95b3a78285334ce7301cf7091296cb9f
font_01_sfnt_off0000edf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF2 18240 bytes
SHA-256: 1d4718ead1050013323211dcfe4ced7ef05bcb78e7b93b5ff94ba39a52e3a849
font_02_sfnt_off00011d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1