Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ca858062febc57…

MALICIOUS

PDF

82.0 KB Created: 2021-08-17 04:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b777a994c534e8e21ec336411c0624d4 SHA-1: 75562f7f756d7b2e2a214b8358534cc9871405e4 SHA-256: 24ca858062febc57f4128ecbdcdfcfccc6abb9ead818994b8af4d0a4725552b7
164 Risk Score

Malware Insights

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

The PDF contains a link farm with multiple URLs pointing to compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of a 'download button' lure further supports this. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 7

  • 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.
  • 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://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/97d36bb7e1ffd7edd38acfb9610e167e/47487962038.pdf In PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/datoxijedukizi.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/53fkgp8l72br1tp9u9uu1n0io7/67487673480.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/ee8dbf0ef75e7c5a53057cb0b8884aae/45311211341.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/pukodigaxifafimapika.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811aabe246e---87532095556.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609415aed3008---devepamox.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/gegokiwabupetatuparevan.pdfIn PDF document text
    • http://lawngo.net/fckfiles/zogopikivogedigisevo.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/12843548424.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/cb378e6a7e46a196b05e645aeedce8de/motozoxowatixob.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/wekuterekidu.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6c9789dde---11547533970.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f504da63ad---84314955092.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/54408507186.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/cb88875295dc7e50d72320f959eaf7da/bosumufudilebute.pdfIn PDF document text
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/12728073061.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/34ipct3d5oj38gfj8ojuudch2t/wogilugekapodam.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/90a79d00250890eb02d8bc827046e995/19693821231.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b641c60c1---16271857366.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a884d85a0---38616006798.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/wuxilalunewofebuk.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/55039249043.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/simexugisenovix.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/pixaxapetisunafunutiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=serial+number+adobe+premiere+pro+cs6+ls7PDF 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_off0000d7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F1 11108 bytes
SHA-256: c7c55df5f49327f04074d98c010e1bd2be8509cedcf0c82c218b43b2efb697ef
font_01_sfnt_off0000f18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18F 18712 bytes
SHA-256: a73a50ba59d081869e27b8f7b889a82fda4d61747d1d4a9937c1d2a696a8e2e6
font_02_sfnt_off000120d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1