Malicious PDF — malware analysis report

Static analysis result for SHA-256 0052dec44ffb0517…

MALICIOUS

PDF

76.1 KB Created: 2021-07-15 13:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 72aca17279039e0a9d4c0daa943a6248 SHA-1: 7880c763d8601d140799770191d3f7e4c4447eae SHA-256: 0052dec44ffb05178dd63874c87779a2c110259e68ac4efa9a7e03a25a3aabc3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://anhuishangbiao.com/upload_fck/file/2021-5-5/20210505155902448730.pdf In PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/v5ctr0naqtsqord63il20d9kir/31043429853.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160782014b386e---kojakinito.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/96749631011.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/55821823781.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/nufuxesorakakafobiwinuno.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021070710511980554.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/81675653178.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/45ei21lnqsh2i1i37fpr6u3e63/xobukoloma.pdfIn PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/5187156561.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/64692175992.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/pigemoxisusedinevu.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944f4451d6d---8042898835.pdfIn PDF document text
    • https://avvocatoboretti.com/file/wetenoravoxodetuze.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16071e16012290---gisujidobelorexi.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/1d00601630582422d240a316bdf0386e/85425020326.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160728faa3ec7b---74568503975.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/6835743895.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d91bcf1e9---sazasot.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ue08metnsk5so0lmhk2922gnn3/ketugijug.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/f65jnjgdnq4bis74a34nk41b13/52572167878.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021062805105673499.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098432411977---vidupukujivezanizofavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=verve+remixed+christmasPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B3 16720 bytes
SHA-256: 78aef5052a247d3fea73ec059746193cb66a4cdf602cb1fa8a24f85ff1d9f507
font_01_sfnt_off0000e4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F6 3100 bytes
SHA-256: 16f98b417e5e3991d5a51ba3e6967e379bc751f53092f33831eaa5899207ad76
font_02_sfnt_off0000f171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF171 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10988 10500 bytes
SHA-256: 8598739202e476bdca824be94a2c1db2d3e768d02a17b73ba3c2295d37a9bdb6

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