Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1148aa1d38e167e…

MALICIOUS

PDF

94.0 KB Created: 2021-07-28 09:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: b39e25ea66970159524a9392f31c1a8c SHA-1: 063f1cfcc530c75f2aebe70e56c0fdf70cc70be5 SHA-256: b1148aa1d38e167eab2efa30b0fe51d7b63e138694707c849f5b31974350ccd1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The heuristic 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/135598020660d999c1a2564.pdf In PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38ed30bd5c---84472524331.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/puzulasajoxatinulurud.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96f8fe25e3---50176773316.pdfIn PDF document text
    • https://tomas-music.com/contents//files/5404211394.pdfIn PDF document text
    • https://room12shio4.com/contents//files/medexonikejujebixe.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/10241116975.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/voruzadevuviri.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/gazilefimuxodatijonun.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d54eac7c12---91554690815.pdfIn PDF document text
    • http://zuche0551.com/upload/file/darivuke.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/i241i0a2achcfqogkvsp27c6j9/22549744042.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/wusupet.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/61108502263.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/0543a792e75324b99051e46c18bc462b/sebirezovub.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/98ed8842721a9e5333fc9a7aa911976f/10807377412.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/113ca08a0ba9ebb0141d8ec7678467b4/42731695137.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/h6qmd6ju80aelgf47co0o48kue/taroturavifupikolebemon.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d09c83f11---kozenul.pdfIn PDF document text
    • https://limsurdua.com/contents//files/84901693202.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/88053162276.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080275cbbf43---donubewekidoxenejaz.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/ruwirewam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+many+food+allergens+must+be+declared+legallyPDF 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_off00010b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B66 17240 bytes
SHA-256: 9b24d3dc1439e45635ffe862a5b1766fd3105e1c60528cbd7b77432610f6acf1
font_01_sfnt_off000138aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C1 11160 bytes
SHA-256: 814514487755957accb9f6371d0de2e556c7ed0f4883c82f5175a7fc6951f610

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