Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a76c6b2d2f07f19…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 07:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bfee518d50d46f9b4cb9b7a9fb619a0d SHA-1: 81a7fd46167026f86bf1faf88e309c7fe3ade076 SHA-256: 0a76c6b2d2f07f1957e5a43f4e2615920e7bfc5d0671e58cb3c1a61eeddf89fb
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 CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farms points to an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ketchas.ru/uplcv?utm_term=lucky+patcher+original+app+download PDF link annotation
    • http://gajagotour.com/UserFiles/file/gunufinizezazago.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/dovifetunup.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/85757631269.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a98138381---30265439921.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/1074219941.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/32597519105.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/77353194000.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f5d0d3709---wajozinenugadasaberukadod.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/73204756526.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/24717194049.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/25e1bdd40007f21fc43be54a9944f879/kogerugozasurubizole.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/79745412155.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/35193163244.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/87442694527.pdfIn PDF document text
    • http://dkind.net/userData/board/file/wised.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/67286737066.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/82851252045.pdfIn PDF document text
    • http://archive-2014.humandoc.pl/attachments/file/nakimip.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/gewepavoxojidaz.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_off0000d82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF040 17880 bytes
SHA-256: 3396b82996853390d170d2e5cfc279f8dc99840c8dac7112b7946d996bd877bd
font_02_sfnt_off00011ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED7 10976 bytes
SHA-256: 4824554914844635ceb9468025754bb5053761be4fa7e2743eeb7101d7c6e00b