Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f52e5d47911090e…

MALICIOUS

PDF

79.9 KB Created: 2021-09-16 23:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2b8905c75d1b6b1c9e4f88273a45cb9e SHA-1: 8cfce482c2058322402f0838b7807ad29d8fc559 SHA-256: 3f52e5d47911090ec4be11c0d80d100ef65c24f795b9b5ccd2a69b3417913999
204 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to external resources, with several heuristics indicating a link farm hosted on compromised WordPress sites and disposable hosting. The presence of embedded JavaScript and a high ML classifier score further suggest malicious intent, likely to lure users into downloading further malicious content or engaging in phishing activities. The ClamAV detection as 'Pdf.Phishing.Trojan' reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ganport.pl/userfiles/file/93364777965.pdf In PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161403d7b0f737---xebinu.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/17784861339.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/ligimopatini.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///22924895576.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/dabaxawolezi.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131bed8c6e4b---xekebiporipusibila.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/72903242377.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/ralose.pdfIn PDF document text
    • http://sevenhillsgroup.net/ckfinder/userfiles/files/39323272951.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/vosumuz.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/sines.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/nurovimazajosibugitale.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/redifojopamabenem.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/16283099130.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315201e6a0b---dojabibi.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/joxaxujo.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/nozolesuvukefolal.pdfIn PDF document text
    • http://yejida.com/userfiles/file/26521779295.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/47170898859.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/71498132671.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/kotulekurowetefeg.pdfIn PDF document text
    • http://vektor28.ru/userfiles/file/97337288284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=comicrack+apk+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_off0000d43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43D 17764 bytes
SHA-256: 56731501d7536b61885aaa134b4dc1643c26aaebb0bca59ffa7299006f1819b5
font_01_sfnt_off0001020d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020D 10484 bytes
SHA-256: 2a907c102b5caf3056e88bd0295cf3e14c529a115e5e213330ce98420f756312
font_02_sfnt_off000119da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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