Malicious PDF — malware analysis report

Static analysis result for SHA-256 604252a12fb32627…

MALICIOUS

PDF

73.8 KB Created: 2021-09-19 11:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 088b3b6f787f13bbc165f0b0bbb984d2 SHA-1: b01a81b26c1446c4670d3c0890555933516f55ce SHA-256: 604252a12fb32627aba8e74a7d9cde7f74f99276312830cb92fce5fdd51c7742
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure suggests it's designed to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146adbf1b314---88306979267.pdf In PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe32480d0c---55881519200.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/24415583557.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/0v7ht6rid37n9rprc3h0mka3as/zexisusanupevufuzilibe.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/sidotorap.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/20937300730.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146801ceceaa---tuvepisodebuf.pdfIn PDF document text
    • https://brakos.it/file/moborujuzetipunili.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/4158227143.pdfIn PDF document text
    • http://lecostationery.com/files/file/jufojipi.pdfIn PDF document text
    • https://datajournonepal.org/files/22816742295.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210917233014.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/zutirutuxizusemezedidok.pdfIn PDF document text
    • http://soc-in.com/data/media/files/26121328144.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161372a758031b---pisurifujuwup.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/12460695565.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/fesagujukudisen.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/simex.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/11233551449.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406bf0a6cfd---xigitavuwidak.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/71917164618.pdfIn PDF document text
    • http://expresskaliski.info/file/42271919699.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/92424708731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=android+mobile+trackerPDF 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_off0000bf8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8D 10576 bytes
SHA-256: bf194b6c62a5cbe9c24d213cb47dcac32ede4093fd2a5e3eaf8bd708e16b07bf
font_01_sfnt_off0000d7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A8 16356 bytes
SHA-256: 50726b2d6aaeea44aaf0e78abd25fa8c5b69ae7ce0e3d1f64c109d54907238ad
font_02_sfnt_off000101a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1