Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2726ced8db2ca3c…

MALICIOUS

PDF

79.6 KB Created: 2021-07-17 14:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e89e701cdec5f837b8f4c14b1c2538ca SHA-1: 05404017f530acaca5227b44fe787389933dbfc5 SHA-256: d2726ced8db2ca3c1b537ec0b3a75c45912bde4b5de63808255ea281644326c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by multiple heuristics as a link farm hosted on compromised WordPress sites, indicating a likely phishing or redirection attempt. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/c4d2a4f78ac89e11f9033a80ffd3682a/bakafaxesapogo.pdf
    • http://anhbanglaw.com/userfiles/file/80591310187.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/pelawu.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/e50ff5fbb38bb0cc516a6a130f6c58a7/73515221600.pdf
    • http://hondatayho.vn/images/ckeditor/files/27943893269.pdf
    • http://rmgoals.com/userfiles/files/peperom.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbff863d820---31557383080.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2d86de812---75566558561.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/fe4672ff3a7103c5aaa8df3b9a483585/52274080094.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/l5skenlsbd5rstdcp8dmq3gi2r/14496256079.pdf
    • https://editions-tlp.fr/ckfinder/userfiles/files/76723365416.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160f24f6d16d64---79386131946.pdf
    • http://thechelseaff.com/user_uploads/files/84076555105.pdf
    • http://whkmradio.com/userfiles/file/jalapuloselaberanivalu.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/26279cf2533a913f6842d3b571bd9c41/84868302722.pdf
    • https://mingyi-lock.com/data/file/userfiles/files/66803116573.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/bdol5phhptpnba1b3olujrroi7/litujiv.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/soveb.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c5fad2f70---18012938412.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/8c129b9e54b9d9f879e6c4f5b5d0250d/90935315404.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e9155abae62---matevopim.pdf
    • http://ctkupavna.ru/upload/file/79834470197.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e943277f6---gupezivik.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=chapter+26+sound+answers
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c8c387d51701d782d9a8ffed2f44ee7d/vuvujuvosudelosurexod.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d285.bin
61302e2be96512042222dbdb30806084cc216b3cbaf5905d7dc7e2353b0577ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xD285 16812 bytes
font_01_sfnt_off0000fe79.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE79 16792 bytes
font_02_sfnt_off00011690.bin
9b8d9de69e59980ded9b272d78882cce9f04b5094f9621f5c44bc93fd9ae4b0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11690 10856 bytes