Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e3e49fd26825df…

MALICIOUS

PDF

79.7 KB Created: 2021-09-01 16:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a73d96c11d600512c02285a754e7d5bd SHA-1: 58e79e0fa2270e766f30b370c38ee6774e003830 SHA-256: a2e3e49fd26825df3c28c98529cda7696fa2e12dde923c71f31ae4224509200d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure itself does not contain readable content, but the heuristic firings strongly indicate its purpose is to redirect users to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://chi-kara.net/Upload/files/rawutowazewilu.pdf In PDF document text
    • http://smn69.com/clients/866038/File/fakirawufapaxovimerirozoj.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609004c899a54---41891930026.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/d63612a63ed72a8ee20138d69a50a52a/42838766946.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/4d3b3fd1e77c578a7dbfb49b0d1cfc18/65902759352.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/tiludigokodalidoxak.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/35u555vbffh9qn7gqmi2icj8tf/98179996546.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210816233056.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/vuwakusawibakibojibo.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/fomeberoderanum.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160831ab01d3c4---98656443336.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/fed08b612d09d53d55727780fc3ae588/vegokefesale.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/53830119735.pdfIn PDF document text
    • http://pt2-turbo-j3t.com/contents/files/movenokesali.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/32469150706.pdfIn PDF document text
    • http://ippon.lv/uploads/File/75381525426.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/42635698595.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/e83de07f6d56fd86ad0b6e747df195e8/40232380053.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/zudipugubafozubitidera.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/rufiwopipisu.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/sekik.pdfIn PDF document text
    • http://51www.org/uploadfile/file/49162993d4b2590fb6309c0fd4de5043.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/35446cfe073cc19b60fe5fa2d4c38dfc/51669922273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=healthy+bmi+for+teenage+malePDF 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_off0000d50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50C 16660 bytes
SHA-256: c00aa9c6a780e63f4da22b1bec317fddec828fc95dbe15ef736c1ecbebcdd05a
font_01_sfnt_off0000ffe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11800 10736 bytes
SHA-256: 888fe266a8c5372e0a449a9ca9e9db1bc929b323df0933915d2199610437e6d9

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