Malicious PDF — malware analysis report

Static analysis result for SHA-256 321d537d3da5a7df…

MALICIOUS

PDF

120.3 KB Created: 2021-08-13 11:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e1a4aecd2bae824c0f3c17f43f9db8e4 SHA-1: c8aa43a2508982f668a55ce8810278f6a3c629ac SHA-256: 321d537d3da5a7df4554d3ae428584c9a52441942ec496166c2f3f225fdc189d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised CMS upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://tavcam.com/upload/ckfinder/files/dulelopavifekapasago.pdf In PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4b20c78c3---seruliv.pdfIn PDF document text
    • http://podushka.by/files/files/lirabuvegaluv.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/b24a71f6776ea4e21f2e2d82e9d60a08/49056524939.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/mikujowizu.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c33f0f2443---dediwudovolubipusuli.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/birujerufevudo.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/1c4e05de670d7e8f1e08008167130da9/29545363442.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/19caef49588c52b2f7e05288460bc18f/suvaxevifitokede.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/p546j7mv0u51fdu3uc0f13hj01/mofil.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/51662601729.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/bc2b97ba16488aa74d37c40c9db6cc6e/gapewoguzoginerizu.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e5a9b1c0---75432273156.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/rkn2431rivu843u166prq75kv3/manibi.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/sudapu.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a42ed2a0392---kedidizapinuwavaba.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b031cf0bd8a---duxanogalavawutanuxetos.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b329d7748c47af0c4a40bb3a750d8db3/11286621690.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/62454376338.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/vajolelonikesofonasunix.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/jezigafadowi.pdfIn PDF document text
    • http://imaginove.eu/data/Files/63493016295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=animal+farm+study+guide+answers+pdfPDF 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_off0001762d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1762D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E3F 16656 bytes
SHA-256: a16f6ca7e51dccc4386709ed1d5e4d2638109aae79b85b72eabbfc60e7544c11
font_02_sfnt_off0001b94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B94F 11000 bytes
SHA-256: e496e1eec736930fd0c817af901d3ac4986a17e0b705f734449f3db1b42a378d

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