Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d7b2634ecf389c…

MALICIOUS

PDF

84.9 KB Created: 2021-09-06 14:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0819cdd5b9cbe195e96b72016d1e5372 SHA-1: ca8cfcc494c86880eefb124861d47e403b667e40 SHA-256: 63d7b2634ecf389cb13ebf0ab40f6718bcfd48e608f1c5103f3c40e86a72c5ba
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised or disposable domains. The presence of numerous PDF links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest an attempt to manipulate search engine results or redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://willmarlakesarea2040.com/ckfinder/userfiles/files/18852458054.pdf In PDF document text
    • http://goldmustang.ru/files/files/firomoxovusimixutadiwoz.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/60413667057.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/24044369824.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/refonexipixifavov.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fb24ddbd1---zosonumiwaxuriburuv.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/036etbvsvpel7hsmo15lgr9pht/kowogetemonisagerujalise.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/10134352002.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/5858706022.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5a80c3c3b---fisovonemotuguzo.pdfIn PDF document text
    • http://metall-press.ru/files/7631235944.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809f4859c62---53042434989.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9946de9fa---50601717949.pdfIn PDF document text
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/48972554215.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/65162755789.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp//files/levidotudutorojor.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a978443fbcb---zusajasuwaxola.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/vomawusiwokumutinepat.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d996b08c6---60353760645.pdfIn PDF document text
    • https://people11people.gr/uploads/File/31657437191.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c992f331284---14262527429.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/jejinogakoz.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/12792922811.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/4829c1383f14b6a32bb974745fe76563/valatafasamunaxaxedan.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/teselafimunavetudavini.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/49724081514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=reduce+reuse+recycle+essay+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_off0000e5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A8 18732 bytes
SHA-256: 376f521f793fda4793969aef6f831e5771ffe59df678182de5983a76ca663b0e
font_01_sfnt_off000115c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDB 10460 bytes
SHA-256: d11730a9e5489dd9c90c6fd2e49acc3db838a9880eda114e1ac6144f0e8febf7