Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dcd5f90e1bbe52b…

MALICIOUS

PDF

79.6 KB Created: 2021-09-07 11:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3d8d6be3947224fb2773a0c492a6cfc7 SHA-1: b3f16f98cd4ff1ea4ca7571e1211031d949277bf SHA-256: 1dcd5f90e1bbe52b10ea163ca6d380f2c699e5f55bba9e459bbd73efb0ede93f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/ed6bc6a388af748983618245a98fe9f3/14577072537.pdf In PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/42a9bf83ed73fadd5d26e3e25bdb36e6/fabifinopejulubokegivowav.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/mibepotigeza.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/3ec5c6243392ce05274807fad7c2b081/17374686593.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/45938579187.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123b76f255cd---juxijimugukajasuk.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/rinelenedasomadukovunil.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/puxubesato.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161349287611af---30302650491.pdfIn PDF document text
    • https://skspiti.com/userfiles/files/32819952255.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bc755cdd26---ledivuwuweburiratisos.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/76540000594.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/bbae05591d4fdc7f4069f6e10c7eee80/38113580046.pdfIn PDF document text
    • https://biodez.lt/i/File/522694204.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085eeeb4e11b---juvujep.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160befcb9212a4---35387678559.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf850e5ad60---wasotonuzuvo.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079d5f43384d---kakujujetig.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/ae32444d551d337bbf0265ba18f3a2cd/35037937288.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/ea5479713835e0dd94a81f4e4352d57f/92140881803.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dba61bdc362---42098801279.pdfIn PDF document text
    • http://candientushinko.com/images/file/kawozuvaf.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/56130909491.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/ditubemeragol.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/cf4ceb485230e8bd7e35c98c5ea3433a/nezufefugagovezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=describe+the+types+of+parenting+styles+pdfPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/11442840261.pdfIn PDF document text
    • 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_off0000d34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5F 16960 bytes
SHA-256: 2ca919385fdb610250a3154dbab7d895c29796af77b632a89373637108cb863d
font_02_sfnt_off00011722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11722 11156 bytes
SHA-256: f582d41b9176ab22dfa74bc4489012c6518cd031c31a64145320fc79ad7a3ba6

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