Malicious PDF — malware analysis report

Static analysis result for SHA-256 c19d783995e89c3b…

MALICIOUS

PDF

77.0 KB Created: 2021-09-06 13:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c9059a1f168f1f26c04f3d345a24aa0b SHA-1: 99d3d4068d086e327bee3c8b1ccdac7887c090be SHA-256: c19d783995e89c3b67915a76aac0e506bc88313a9a21b54051c3047c9a6663a0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The file's structure as a link farm suggests it's part of a larger campaign to lure victims through compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ailani.org/wp-content/plugins/super-forms/uploads/php/files/b4eec43da1457fe8ee3edf9ea3243253/puxajigedumozonekode.pdf In PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/33230304369d333537d42c5bc148f567/vubojivuselog.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/woxugotoxad.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/55be9533cea3193e59e5c637fce60756/jezabofodosezakaloxunomel.pdfIn PDF document text
    • http://beateromer.com/bilder/file/fudeninemegiviloniriposot.pdfIn PDF document text
    • http://thecuriosityshot.com/91511987722.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/juxaferojasedababelanuteg.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/84052955472.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/vepisu.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/63610729409.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/081540b062b2aded9e30bea27c5e490f/53265117964.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/48057726201.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/luvotijisa.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/zijatutabedexagibugime.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///79949997237.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc304be13f3---lozidoxuruxikuzukekawox.pdfIn PDF document text
    • http://tecumseh1962.com/clients/85183/File/18450969217.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/fd631183fb1e4eb0b4bd7c7d5cc2d44a/65521047351.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3034126543.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161119792bad5a---rososupafemazodowoze.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af92d2dd7e6---69120093768.pdfIn PDF document text
    • https://birudongker.com/contents//files/bebunebefobem.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/rijizivofilovad.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160de1c5025898---32450074169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=aporofobia+pdf+completoPDF 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_off0000c6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DC 10632 bytes
SHA-256: 26df34c12fe4057e377272a40119b24502490b96c3b2dba1baeabaaad7356600
font_01_sfnt_off0000def6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF6 18032 bytes
SHA-256: 7aba5c4499b05949632485153da6da2e348caf2b09935502f1a76362e98e098a
font_02_sfnt_off00010df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1