Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c9661bd7dee21c…

MALICIOUS

PDF

80.0 KB Created: 2021-09-01 18:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 85c2cf16d064e6db646ec8001aaa5939 SHA-1: 787f1fa95191f8b76214f2b63d07ab80b81dcb2f SHA-256: 77c9661bd7dee21c6dd649af3a8954c361d7ab10d1c5600e31bc26d99f491ca6
164 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 as malicious. It contains a link farm with numerous URLs, many pointing to compromised WordPress sites, suggesting an attempt to manipulate search engine results or distribute malicious content. The presence of external URIs and a 'download button' lure further supports a phishing or malicious content distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://aldea.work/wp-content/plugins/super-forms/uploads/php/files/1a6b4dd7cfe58be5f9299bdaa3b6de9a/33164071541.pdf In PDF document text
    • https://tonwen.org/userfiles/file/95203930888.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/0c9672e094fbd21bd7d3fba791cfebde/sewatanuzapezowufajumovi.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/gedabitovajukezojovinop.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/6f3b0309a9mf1sq4mg1qe7m7t5/ginonoxa.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/95650719963.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/zowapa.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67dea28a75---zekeka.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/xatexerotegiduwi.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nofawapidawop.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/marezaxaseb.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/bixabudoxi.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/38407358389.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cd460dfc8---nenalawi.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611a5db3bfc8c---94886152416.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/2i03v93i88oq9rv2ihdroqijo9/63654703769.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/zudodevewipu.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/3689e132407088d2f3e54b6751891157/29899289413.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/nuropadas.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160902db12d5f0---53715523175.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-7/20210507024953798664.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/sufenu.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/21818272743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ace+the+ielts+full+book+free+downloadPDF 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_off0000d2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE9 10972 bytes
SHA-256: b99c060277a63e9e1cdb77b892d0ef8338cdaaf575454ca6163dc9c0ebdc6aca
font_02_sfnt_off0001046a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046A 17868 bytes
SHA-256: 9f1ae6aa9169420109c3d2f00254b438194e6f9a50f72de02d9f11429986bd2e

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