Malicious PDF — malware analysis report

Static analysis result for SHA-256 081a97f0cd4c1ae7…

MALICIOUS

PDF

71.6 KB Created: 2021-09-17 14:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d1056bb710f1c9d667494d7c125ea306 SHA-1: 4615250b574555a0c38ad99464b5a25f7e61dfcb SHA-256: 081a97f0cd4c1ae7a0eba864502ce4a010da872604cc05389a843b80c1bf4377
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that function as a link farm, directing users to potentially compromised websites or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further suggesting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://krisoc.ru/uplcv?utm_term=live+telecast+full+movie PDF link annotation
    • http://pivotal-technologies.com/userfiles/file/xegapomotorizuxo.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436d34ee18c---60498464342.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/liketaxof.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/vufodijevilivig.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-07/210907001743079539pbbvrrkpowns.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210903011724974.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/pelupogodixuxela.pdfIn PDF document text
    • http://ijfbn.com/editor_up/fosemimomu.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/97660475951.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/72c054b3e23dfdf4b9e833cd70051b48/venebogodif.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/65585450281.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/95978724231.pdfIn PDF document text
    • https://flyags.com/editorResources/file///56852357181.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e394a237a7---kabirewebufubuvivel.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/notovulelakajiveronaxisej.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138267a044d2---52261025461.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/zijelikuxoja.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/97053235360.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/417b105ccf373e2100050c02c5c52f04/jogopawenereriropevawi.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/3a3a7c8b4d64fd93efc77f24d7a6d932/nemodowawuwewutijenodi.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/85332706299.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/wubijaludumagijej.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/720nlkq7j34ouoo2cnol7l3j63/92458855629.pdfIn PDF document text
    • http://snft.ro/media/file/43321273640.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_off0000b689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB689 10416 bytes
SHA-256: 22614d4b31953758ca45a607a828a4f07a5e080433b77f923f1271e3b56eab64
font_01_sfnt_off0000ce36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE36 16620 bytes
SHA-256: f9a1b32f1839c5d0a4955359fd7627b9f13bda1f93fab447e1ed61a5e35af0f9
font_02_sfnt_off0000f8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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