Malicious PDF — malware analysis report

Static analysis result for SHA-256 422562f5a11f75dd…

MALICIOUS

PDF

95.7 KB Created: 2021-06-27 14:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e23b1f2bfd0f14db67b16d1ef7a02be SHA-1: 1c41f5e70b3369d8c1910f9daba3d66b5f0357b3 SHA-256: 422562f5a11f75ddcd6b4c682adae1f2920a6f905d21a92aba761cdcb06279be
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/f8a161c9129dc3da82b007dd1f88b49f/26218417638.pdf
    • https://buka.ru/sadm_files/89714615477.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/r1tvgtnb135rg31a3q80bftni2/disaxuvikul.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160828edb2aff4---40255518973.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef93917d36---89923581719.pdf
    • http://kursadowicz.pl/Upload/file/60013701245.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a8516e959ce---jugokobefuralazuduxarixa.pdf
    • https://cytairtool.com/test/userfiles/file/20210618_df026.pdf
    • http://poiskvod.ru/images/file/82673711957.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1afd8bced---62159059358.pdf
    • https://f27szerviz.hu/upload/files/demajorajadulagesamu.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c7a659db2---39283431463.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ac95300a6---17525963370.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609b45c084d74---1660538955.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160787521884a2---3160038015.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/c1844d5c2bac490c0a9e0c097a9ad10f/kaninivanuluzapogimodi.pdf
    • http://alkanboya.com/files/file///95506054534.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5508591dc---govejenaxixilelafive.pdf
    • http://parvazyab.net/basefile/api203/files/82219908147.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a02a5186037---42078501965.pdf
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/94191309409.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/a223ad930c2b592446207e8bd97a4fa4/juzorenovatitogutomet.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/09d003d4431f8fc41ec30c6d38f5560f/30484980269.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/hdk7vk3b1f7fuuniboghu4eej5/vapivofored.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b600ba11279---69757735724.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=sql+order+by+string+as+number
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e8f.bin
5b8c46ec343f794dd333f5a22cfde8dd86f7c1817d6e172b182ef62cda8252e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8F 18504 bytes
font_01_sfnt_off00013fcf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCF 16792 bytes
font_02_sfnt_off000157e6.bin
0e9e160af3219403c5c8a11e7f741453a48880e0590a5bffd19e64984d5e8da6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x157E6 11164 bytes

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