Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fefd22b9edcbcd7…

MALICIOUS

PDF

70.7 KB Created: 2021-09-05 04:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 736f031eba9b06b429b35609e65f5a2f SHA-1: 4dd7e2ebf3262a1b65fa6dced6bb620276ec2d2c SHA-256: 2fefd22b9edcbcd7bdccea9b0c830b28287a9dd2190b6fc4b62130237452521b
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct hosts, many of which appear to be compromised WordPress upload storage or disposable hosting. The document body is unreadable, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zonwering-nederland.eu/ckfinder/userfiles/files/83260709144.pdf In PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160891564d14e1---lorese.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/baligimulajexof.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/93568085428.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/32b7a3d97a9c0d95151fe52f34eae8de/mugefojijiwizuwejetud.pdfIn PDF document text
    • https://curryleafharleysvillepa.com/hang/userfiles/files/98358314323.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/maduxiputipipovibit.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/paxadugada.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/35515318786.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f15f3789b---vufisikujinejanuvu.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/52216321555.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c50e92118eb---37779455862.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a6d5cc55---veruloresemalaxu.pdfIn PDF document text
    • http://alconburyreunion.com/clients/36523/File/surulejug.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/wolekoterapanake.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096262ec928e---24331809828.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/188708944860a1c9f3d0781.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fb807a689---43235513860.pdfIn PDF document text
    • http://paliukenas.lt/i/File/fazubupoworawega.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/42774737991.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/wizilagibimadabufavofe.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/36053569663.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161235b378a300---nanazigudomajideruk.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/bepenajarivav.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606de3577198e---56055536098.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=sdg+10+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_off0000ba29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA29 14856 bytes
SHA-256: eae849647c4388d84c35f0fb924f8bdaf89fd26d845a59cedc88c50d7c43e7be
font_01_sfnt_off0000df5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5E 9900 bytes
SHA-256: efc71873bf2af6264ffadf2e24669d963009070f78e9b5cd7db7ac1f5fbb5960
font_02_sfnt_off0000f51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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