Malicious PDF — malware analysis report

Static analysis result for SHA-256 03a70f7731a6f5c4…

MALICIOUS

PDF

91.7 KB Created: 2021-06-27 23:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e0beac75e8c1d3abc3dc05351ab9fbe0 SHA-1: 4f5239f75c8bb4a420e1072a728730346376cd9e SHA-256: 03a70f7731a6f5c432abce79691eb5c613dc89e67da758d8e2114d7ccdcb0340
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to potentially compromised WordPress upload directories. These links likely serve as redirects to phishing or malware hosting sites, aiming to lure users into clicking them. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878dd9b7091---33879152780.pdf In PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a33a01cafc8---42910127605.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/q4e06b7t45heffiab2gd7c501k/rovifarebilewevaxisok.pdfIn PDF document text
    • https://proxus.nl/file/10579100150.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/47431708664.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/16165351934.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/fe8cb7b8f1d979e032524412228a001e/5306334595.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/29a393a44b43739ce3ac3e6cee8d144e/4825367828.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a410e13815d---22776046349.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/maxisoketozalepobo.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2e9ca9a03---bemovejabemav.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/3rck97l072kh986v5n2o18g9jg/38540493290.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/gitekatuzekojunedatis.pdfIn PDF document text
    • http://teaandtiarasottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/debamikikaxojud.pdfIn PDF document text
    • http://www.bandungmesin.com/file/libuzujavawakosox.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/tagisazeganavata.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/16032769408.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/gadawulefejibajitem.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089fd6c49710---pamemubagujode.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863ff3371e9---83270334614.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16207789908987.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d3efa17db28---sonuba.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/aprq200a43pftd4q5ajoa0hir7/bifave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=quiz+rounds+and+answersPDF 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_off00010318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10318 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2A 18036 bytes
SHA-256: a4e9e2c830754418fa3529b7fc5591c0b40c28d77e77dc651aa6b5883a2d7068
font_02_sfnt_off000149ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149EC 10404 bytes
SHA-256: 16f69424712a7fb7c9bdc99d739a16240db8afcad139a9abec931f4a9e48b174

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