Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e8b4e1cfd33047…

MALICIOUS

PDF

69.4 KB Created: 2021-09-26 05:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 593aa86770b23f079f98aab039cc6b27 SHA-1: f0bafc37d6ca0c72ce66ac332805d1f8f6475e6c SHA-256: 20e8b4e1cfd330477d0a39c4a46069950507d25b55689d5583f3c143e121cb39
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing numerous external links. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded links point to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pinkrali.com/calisma2/files/uploads/renuzumimixesexaxulejiv.pdf In PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/fokipumuxe.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/27224514286.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/xofosofovomaw.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/85237038437.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161367e189bf19---30233600641.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/52052059108.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/doram.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/movane.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67890275437.pdfIn PDF document text
    • http://bushurov.ru/images/files/fegakibixule.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613064b73169b---gizab.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/kodokotilegirosiluduruwor.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a961cac084---pigetuj.pdfIn PDF document text
    • https://mentormedya.com/files/59680135586.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd7a95d660---42869170705.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/57739377446.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/larerokam.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/puzabugutiwebokilo.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/36244647086.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/wuxomejozuniturodoji.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/bonusitafimifafodafelorip.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/pekifupijenesuratapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=cinema+123+free+moviesPDF 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_off0000b191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB191 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A3 14364 bytes
SHA-256: a3013ef8e0722384307cd3fcaabdab313f0273e196181e506da2842159060ccf
font_02_sfnt_off0000ed87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED87 10672 bytes
SHA-256: 2eab75df514c6eebf1b69929c892f37fcf9139e3eb1af13e3845dc7b77f0bae9