Malicious PDF — malware analysis report

Static analysis result for SHA-256 a367aab52be30b77…

MALICIOUS

PDF

78.0 KB Created: 2021-09-19 12:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 99261cd8a000cd8c7124f3c2089f9db7 SHA-1: 5da27a9c6bf36e85bef9fc11b43fc0b5ff1b43d6 SHA-256: a367aab52be30b77503dfaa8ac1107ecfc60df93abf2be08618a1c1cda44fb90
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to lead users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://lesura.net/userfiles/file/towafiwazakup.pdf In PDF document text
    • https://cometsecurity.in/admin/userfiles/file/73937716620.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/15680050338.pdfIn PDF document text
    • https://parc-hotel.info/file/91867311620.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/vibosa.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/57113383534.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/32102160679.pdfIn PDF document text
    • http://popmetre.com/news/files/51005001430.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/t944bq75o5g5aceinlsujkuste/36866192223.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d79f5e305e---fijaratukeporegadewed.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/fidadep.pdfIn PDF document text
    • http://pedraferro.com/files/files/furajususibejekutakemi.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/59962276345.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/70033499145.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/fenatotifuvurivogez.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613545f32268f---55517185338.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/takowedofememarevo.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/42487438395.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/92762012886.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/69482243307.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/30552167465.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140bffaadd55---63103031468.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/sulenab.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/mawadanoxesifuwuvetuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=samuel+taylor+coleridge+the+rime+of+the+ancient+mariner+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_off0000c79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79A 18296 bytes
SHA-256: 4b98c604b6ba766df9a263b742a6a1bca5f3246ec9c26e364beaf1fbdface959
font_01_sfnt_off0000f665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF665 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7C 11188 bytes
SHA-256: aed4a74d2e76e3535eb826755501dc10a1deb5ef3a6501b2cd5d292c18f10a13

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