Malicious PDF — malware analysis report

Static analysis result for SHA-256 52bb02833ab549a9…

MALICIOUS

PDF

92.9 KB Created: 2021-09-07 15:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4a40c7ca44f79b1afbf8ba59cd9f2dad SHA-1: a4543ecf7cf2cf2cd804b7621f17c0519dd7eee6 SHA-256: 52bb02833ab549a9771da89d34bdbcf4c1a31fb720e3b19a74c379266516be91
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, likely intended to lure users into downloading further malicious content or visiting phishing sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/ee0ba7aa4d59541cb3385d9d4a99cb67/59496172460.pdf In PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cec916a7d---95751403366.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607596ffab291---pisomuvobizuwuwizos.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/karukipewetaxosivelaso.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/nosaximibezosuva.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pobatuvol.pdfIn PDF document text
    • http://augsburger-dartliga.de/uploads/file/xexiwowuforekaredurulab.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607009c746693---gugugawiwete.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/f7c1e28e323a36f2ff0e5b741a88a614/36518002804.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d096f5203a---80829151266.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/2780846648.pdfIn PDF document text
    • https://tantecoccole016.it/file/pabeligig.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4007be302---89725457057.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/demizuvegudeluzozo.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a21b2754f1d---vojafukina.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a397098d2e5---lupisejazagupejedazofe.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/11817573273.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/jaweze.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/8eb9041d299017271906322ad4ae9d39/puzurutewesegugapin.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/wizanenake.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608baac65df67---zisafukulimavudowe.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/f3368f7f27184b5ed50c8e7c36bf897d/96424367.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160948febd61e5---69624903129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=banking+sector+in+bangladesh+2017+pdfPDF 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_off00010356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10356 18436 bytes
SHA-256: bf05f70a5a733919df82a08a4a54ef083e817189ae821880af578dd56025ef30
font_01_sfnt_off000132e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E3 11528 bytes
SHA-256: 5ad0ad25eff88ae6a74be511dde8138467444d27f4e259883ae2ed64ede4e890
font_02_sfnt_off00014ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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