Malicious PDF — malware analysis report

Static analysis result for SHA-256 65395ed7147b1561…

MALICIOUS

PDF

100.8 KB Created: 2021-09-07 12:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 067238616f4b96c0195fbfd3e8594d09 SHA-1: f483b33ed4e3b2a3124c95c3c9e52dee8d8105ec SHA-256: 65395ed7147b156150a2b0ecb2e8de920cd9741eb5f73fc89a4dea58e56b4914
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with heuristics indicating it functions as a link farm hosted on disposable or compromised domains. ClamAV and an ML classifier flagged this file as malicious, specifically as a phishing trojan. The presence of multiple links to potentially malicious sites suggests an attempt to lure users to phishing or malware-hosting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://mail-ex.net/userfiles/file/bepef.pdf In PDF document text
    • http://seltec.io/images/uploads/files/zovemapikonebonuso.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/b142452ab1748806b4c0c0cf00d0803e/levutam.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160edd48c748c6---vapazefataxif.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/midagigibaw.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f87fe74dd06---88661744855.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160844aef3ca0c---69707327739.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/39838340582.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dac5c3538d---gasibupoke.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/wotif.pdfIn PDF document text
    • http://carszana.com/image/upload/File/41641441736.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/vavikorodozavol.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/2dm6ubj161qcqnsnnt78bl8jaj/77040164635.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/21426632955.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a10d6c04a05---zezudaponuwiwuwemitiriniz.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/li6hstvdao5cti6ncfp9t9per8/jobibuk.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/8f8776d2e63410eb23cfaeff833f4f63/fevevobomoxaxitasipame.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/g68876ltg1bmilfi2hu2fkis6q/39773650013.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/lomipoxalef.pdfIn PDF document text
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/25739269486.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/dedodirix.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/zokitapat.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/34765956240.pdfIn PDF document text
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/luteroduzuvubekizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=analyse+infinit%C3%A9simale+pdfPDF 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_off0001179f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB6 10688 bytes
SHA-256: 25a36f9b759286e2c39ca4ff6aff596d3dcd42f6f38ac96ca2420ee7ecd1997c
font_02_sfnt_off000147ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147EA 23432 bytes
SHA-256: 563898989a5b1f23b7ef0646c78bb32e4795107f0d75ed3fbab026f0a4302f8a

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