Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e0e33b0209e1a0…

MALICIOUS

PDF

86.8 KB Created: 2021-05-15 08:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43caf5e9d46db4b9c67a11e0411fa4de SHA-1: 3b94ba62a8137d8e528ab64f5f67ade5f74aa2f5 SHA-256: 24e0e33b0209e1a0bb8a41ee6d4fb16ed68e5dac14401e302f77a6c20efe0c51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the presence of multiple external links points to a pattern of directing users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9411

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://krisoc.ru/uplcv?utm_term=company+attendance+sheet+in+excel+free
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/9aa60a9866b19262659eb8b779671c57/riwirexome.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757cd6d746d---29540184745.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/44804ff720f681a99dc2ca2600493152/1298521460.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607da949ce8a9---fapiz.pdf
    • http://artecgroupservices.com/imagenes/file/lafodozekebewa.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d893662dc923ca53db5a69571784dfd4/75389598657.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/nb2oe4l7kqmb9i9p1ha834e844/lepavudul.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/b1f588a2945b6934bbf4b3b4b1fed0d4/39633675093.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094d75b5e0ce---22750333476.pdf
    • http://dentherapia.hu/files/file/62526525690.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c14a15ffe---95702672462.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079f73591633---kojerajijodisanagokigaw.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084d9fdddac4---wunozaxitotago.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/e522f5bd43a94d900ba918b42db3c589/52440934014.pdf
    • http://bpabv.nl/uploadfiles/file/12520734680.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/d69535629de5452dfbcbdd22e8bbec98/mejudolosedubebewiduvomeg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e22.bin
f8ed19463a4aad8db0a1c8b8ca645335b8c850074439d2be3bdf203e649a1210		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E22 5468 bytes
font_01_sfnt_off000130a0.bin
420d361aa77d1e5d6d16376131b213a536dbfcb4318218de9eb074af74c75860		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130A0 11512 bytes

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