Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8902a677c059cb…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 07:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 94d579777248b439f8dc2b972d6c3f69 SHA-1: 7548d544a6d31cf5d5a47b261804f1f5f8ae1599 SHA-256: 1d8902a677c059cb126db2629c7a4866063fc81bb6a99e994f40000b9cace7a0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the PDF functions as a link farm, directing users to potentially compromised websites or disposable hosting. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://baust.edu.bd/app/webroot/ckfinder/userfiles/files/22495677280.pdf In PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161306936a8e51---24710430500.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/xikefoputelevu.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/d5a5b06470353b8e96cfe321afe5b8ce/82189990519.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/gonud.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/lazowopugupisufusidi.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/30835877036.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/komulepetiribuzimelujuli.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/91627485973.pdfIn PDF document text
    • http://erex.hu/upload/file/mufosokaxizimuz.pdfIn PDF document text
    • http://videlec.be/ressource/file/7795329174.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3438306a1---pusakuwidagodig.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/21124065062.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/78640366806.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/28125401421.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f622597ad4---rodatijin.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/lowigiruvalovijunateselo.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/tivipapolebo.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/30277118458.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/38295799426.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/8457075736.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450fa0d89c4---newilataremaje.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/loleta.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/jagikotutixeliporek.pdfIn PDF document text
    • http://archive-2014.humandoc.pl/attachments/file/turemusimogufeje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=contact+recovery+app+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_off0000de01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE01 10544 bytes
SHA-256: 335dd521046d9325aeee994b8289df58addfe0986e60e6a645ade7bdcfe24fce
font_01_sfnt_off0000f642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF642 18112 bytes
SHA-256: 706ab15a3d67cba0b4326d2ff90691982a47dcfd1aab21b765bbf776419f291e
font_02_sfnt_off00012571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12571 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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