Malicious PDF — malware analysis report

Static analysis result for SHA-256 9247724f37161616…

MALICIOUS

PDF

80.1 KB Created: 2021-09-19 16:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7f3508dda0da1ac504ae395c8bde29cc SHA-1: 6715bc951604e8e55c68326e024a72c4a59fbf63 SHA-256: 9247724f371616165d9956079e3382af1e9e9392fae4f679dae215e5837d5a2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to distribute malicious content or phish users. No scripts were extracted, but the overall structure points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://consade.com/userfiles/file/mijiwig.pdf In PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc6d963336---43904422128.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614217167e84c---38082815480.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/3705d67db3b46b5e2ffc109676ec2dc7/tegapebesumu.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/pilatiduxez.pdfIn PDF document text
    • http://www.siposferenc.hu/html/rexewot.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/51896740668.pdfIn PDF document text
    • http://cochemical.com/upload/files/revejemurowuvudajonere.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/riraf.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/16095611346.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/95697811085.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/51876536954.pdfIn PDF document text
    • https://asken.as/bilder/file/53913361300.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/bokekabiduwaj.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/12654736544.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/lawexemikononupofadu.pdfIn PDF document text
    • http://master-br.ru/img/file/sesuxonud.pdfIn PDF document text
    • https://oferta.lt/i/File/jopabevis.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/xiwajujonizagusawon.pdfIn PDF document text
    • http://7profi.net/userfiles/file/17521277313.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/bijop.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/65444841634.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133a5be549d1---kosagudugesitepupowozaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+call+of+cthulhu+and+other+weird+stories+pdf+free+downloadPDF 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_off0000d1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F7 10864 bytes
SHA-256: c24c8247f102af8dccf4d0d1cad2010cacca0b9ecb553c6702617570a681ae18
font_01_sfnt_off0000eb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001032a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032A 18336 bytes
SHA-256: a9a538632eb1a6c2e5d5e1cd292735e7544357f99b4b2366c6caa1db9cd73208