Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac3760abacdaa7d…

MALICIOUS

PDF

87.8 KB Created: 2021-09-04 18:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 84f18792d7c3e1a8d1aaed8740445a6b SHA-1: 96575a86141a766981fd0d0aae97585e18aea922 SHA-256: 9ac3760abacdaa7d13f4776d57f2acbce5af40d2cfb141981678a79af167f6fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are on disposable hosting and likely serve as a lure, in this case, for 'forex indicators pdf download'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161035131ab9a1---3188343075.pdf In PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/55107054981.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c72c5801556---xesaporalejetinuvaki.pdfIn PDF document text
    • https://ka-base.no/images_content/file/zipabusux.pdfIn PDF document text
    • http://ipceurope.com/assets/file/kimegewawedugudo.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31346cc071---xotidejukekinifoxad.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/pelugupeguxunadu.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/cd834afd62b42f3436e2ebe6b4be3b47/nodoretikurepimeka.pdfIn PDF document text
    • http://groupkaishan.com/d/files/pakiwerojubupelum.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/muwadeputu.pdfIn PDF document text
    • http://skene.es/userfiles/file/13766997092.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/a91ajgr5o498bme5ok0ffb0ms4/60220578754.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/zakug.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/vimoxixadeterowi.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/13159206041.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61b1fa6629---44449048245.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-25/20210525183825696753.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/36555546091.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/10368227379.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160756979e3990---8029661945.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/cbe2bcddb9732e80822700c8875e74e9/sesadurabopiwupawun.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/tidupeta.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/22722419781.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/40109590178.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/44752884642.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb85738e7bc---faxav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=forex+indicators+pdf+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_off0000f248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF248 10780 bytes
SHA-256: 135c340ac6180470d335e3a087f4cfa7954a606d37ac8d06a7a15710ff0fd287
font_01_sfnt_off00010b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B49 17944 bytes
SHA-256: ae99748e6a87e55b8f4211edf5c68027e2e81098aac86dcac56f85f2cd826d07
font_02_sfnt_off000139b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1