Malicious PDF — malware analysis report

Static analysis result for SHA-256 95e764a5173ec7be…

MALICIOUS

PDF

88.3 KB Created: 2021-07-20 00:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a2524501d9315c2e80127464c7d6a4e4 SHA-1: 1f0dc4fb95e32b1e1939928f4bac41f29d38b5f7 SHA-256: 95e764a5173ec7bebe6d9789b09ac4c57981b98aa6f5bc6feff04ef5bb4362d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • 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://docando.es/js/ckfinder/userfiles/files/6723996969.pdf In PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/cbaff555512e2a1d3ab6f9080fa1cbb6/robusenowaxulujuv.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/58676271782.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/49648300686.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ta2mkefmvjiq7g2ubo8rnbm713/79031631794.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845d03a127c---zekogefereteke.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ec9b0de9c---40356509605.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8701eb0fb8---gipimijidobelodamubap.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ae3153ca4---21001197231.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/2058068613.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/46483722719.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/36597168398.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9b9160ae49c75df22616d4c36f27875/98906707799.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/80622852085.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/muxakozo.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/e465bda4aab33f6c2512bf116ef6cbdb/85230694061.pdfIn PDF document text
    • https://codecs.ro/images/file/supefo.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084efe1ab839---41413060843.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/adqt4papan1ejm2s09b41oeo5n/79449092960.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741d6246612---zokufalezawepudevunufe.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fd69adbf8---gelabigim.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/tilonuxufuwexufed.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/11141777054.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82c8a0e02---97133115025.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160897758d8564---mepanimamibadawumaruniso.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/20415509676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=find+the+first+four+common+multiples+of+6+and+8PDF 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_off0000f65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65F 11336 bytes
SHA-256: 7f49fa7353591a4eacee02b36af7b221e9197a11e0f360c9b64675f3a00e8aea
font_01_sfnt_off000110cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CB 16336 bytes
SHA-256: 61f011749c9ccab5efe26d05d29044dd78e376882c60796ef12fbbc1f41827b1
font_02_sfnt_off00013b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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