Malicious PDF — malware analysis report

Static analysis result for SHA-256 de0d61bd2c8da689…

MALICIOUS

PDF

78.7 KB Created: 2021-08-14 08:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3e8eb4e8c9e737ca8fd4b3800968c763 SHA-1: 6f5577693c738f68510a4a5f61aa7f1b2e809b05 SHA-256: de0d61bd2c8da6897816adf118272968a581260f3d61a245ac40407589915b1b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This pattern suggests a link farm designed to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1d1b276ad---fadapozakisuziwalenubika.pdf In PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/1oko5h0m70fak16ivekro5i9j2/78545607587.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9f2367712---nokivakibazimiwif.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/67174583923.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/riraw.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/duvudu.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/bugotarujiwegezaka.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834b7ccfb7f---pugixoratowikipi.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/e0rbfpj45l0b2ic4oo0ug4jbna/jugomelabuw.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077ddcae4b73---peribebufosa.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971fa877834---75204980433.pdfIn PDF document text
    • http://ca1970.com/clients/10044/File/vanamoj.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f4247779044---piguxisavenusiresub.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ab720136e---nagazezinojapedopegapas.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/65162202904.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/8fe90e5e891c415e5b81664e74872578/kukijanirijevafokep.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/48gtlupnlf8lhere4gtl6in6ga/nagejejajotonetalazazi.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/guwasopevanususuw.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/bagozutoliwaxepox.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/zikuni.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/zasikobuxiwumebogu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609847f6ab7c2---77943435137.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/mowozarubevuzagorudo.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/26056994769.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/63856550585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=political+theory+andrew+heywood+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_off0000d130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE947 10752 bytes
SHA-256: 449e3298e13cdc50f617aca612c79c607b5707b0b761c412a4aa8d43c0b4b734
font_02_sfnt_off00010200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10200 16484 bytes
SHA-256: 4ae475a57f2b8af79072b40a2bd1ffe582beca2da7ada27f65433b39013e7360