Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5658d34c3ede95…

MALICIOUS

PDF

84.4 KB Created: 2021-07-26 23:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9e840f72df65acdd8a2ccf90a6dacaed SHA-1: 2e4d065e73c56a977668da82f6f4cd593efb6792 SHA-256: aa5658d34c3ede9592293b7b75af572dcf56929e4820371369521179686809b5
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised CMS uploads. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent. The primary goal appears to be redirecting users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/5e2c84c307e061f74a36b93482ebd56c/wojedujulukeripimed.pdf In PDF document text
    • http://beveragesgs.com/userfiles/file/61501192932.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/188708944860a1c9f3d0781.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/6ab17436a86c46c7408d1ffe6411dcdf/63391694625.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160929acaddcb8---92709579569.pdfIn PDF document text
    • https://777mto.com/contents//files/64034880535.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10023e3e3f---33479156100.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b354a96e6ee---zuviwewerexozu.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/m285l52tfugoee8ni61ul7ife2/71694368429.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/8b1486dc963322e808dce8f91e9ebf76/40220453726.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/nolutekiruxix.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/31bcd25d479d5becbbb776d8654ff393/riwulez.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/gulewip.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dd3c872e7---6412515199.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/66173571243.pdfIn PDF document text
    • https://btegypt.com/file/vataxuwolimorazaloxiboda.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b5a943747---88568730338.pdfIn PDF document text
    • http://roocenter.ru/upload/file/38044076809.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc316e9716e---pomosoxobofu.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/46011042789.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/a465ca9862d184e0eff631d62d844d4f/mivusepefifixafuti.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/4d9765ab5e90a8aad06a2b5cd19e276c/vosimoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=sopa+de+letras+para+ni%C3%B1os+de+primaria+cuarto+gradoPDF 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_off0000d990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD990 17296 bytes
SHA-256: 8a4f9c02db10485ad008d9c7b076c8842fc4f9d1d95b7a032cbed4c49d670d91
font_01_sfnt_off00010503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10503 2064 bytes
SHA-256: 5221cc56e96b657ff7c15f49bf1fbf1b5222e15cd7ffd769ce953162a3e53832
font_02_sfnt_off00010e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12659 11236 bytes
SHA-256: a58babeb50dcd9a16e1563c400a24fb5f5fe08bbd60edf71f7275edc685e2e0c

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