Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9497d50250839f…

MALICIOUS

PDF

88.0 KB Created: 2021-08-08 05:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: b0417f1736455b2c2ea4cfb7988b4bc1 SHA-1: 06648bfb98700e432d9cdbd11a0153e246b86832 SHA-256: 5c9497d50250839f1ce59a660e8957a1a24aa13af66dce1fc0b8217608b2c666
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of a 'download button' heuristic further supports a lure-based attack pattern. ClamAV detection and ML classification confirm the malicious nature of the file, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/b886248262a104ae54baee5ddfeca1d4/5820915537.pdf In PDF document text
    • http://indel.sk/userfiles/file/menugoxawonixovozikekid.pdfIn PDF document text
    • http://mhspartan79.com/clients/9/97/97d0d0788ec4d6723ba7be3cd58769e3/File/nukebupena.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/90ee1bb0145c3051a5f7a3d6483ca3d5/48929688972.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/23798553006.pdfIn PDF document text
    • http://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/nivobilenevolijitenataxa.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/9003823d8d36fcd35d8156e5b5c7ed14/99156972509.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f70b6b7390d---52817111448.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/vb590ltqt00mlavlilrhsm08e1/96149537293.pdfIn PDF document text
    • http://rc-modeller.se/images/file///kufamasujelegiduxusilelis.pdfIn PDF document text
    • https://bak.vn/upload/files/xazebaravefisudifesem.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/vufivep.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ja3g1qp6nmvp45085n0snq3pfn/nudijilumoxew.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/zoxivut.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879b682ce98---nudazikifujasogolaxorem.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/xuguxugixaj.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/97356883710.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///nobij.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/ziwapotojapebibofax.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9a024d79d---34697587249.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a99cb3a13---75884735282.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa6aea7f22---gesekasamunuwez.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/3e7f7db601d0b75a15c6d0a72bf6aaef/begetej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=download+kamen+rider+ex+aid+flash+game+apk+10.27.11PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA07 3800 bytes
SHA-256: c90c5d63018af84c69f128fdf092ff38f6ed21ed12b6df5cdd9bad040c5c05bd
font_02_sfnt_off000108df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DF 11536 bytes
SHA-256: 2dc1d4dab26ff376c585d5b7582765ff345fb6fed92f41b8e7e9bac6b95d35fb
font_03_sfnt_off000123f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F3 17224 bytes
SHA-256: 9bef09265ce61be78855de7f9a783fc6856f4354de5dc1f0fa091f24303a8e5b

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