Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f163755b7b558b9…

MALICIOUS

PDF

87.8 KB Created: 2021-07-09 04:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5b79b116cc58b7d49b753257fa02ee42 SHA-1: e14ee1449b6f401ca7eee85fc2b5f8b7482233b0 SHA-256: 9f163755b7b558b95f1ca95d460bd38d6d949bbf680e3c85e5a254bcb8f1e2ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous embedded URLs that point to potentially compromised websites, likely for phishing or malware distribution. The presence of PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic suggests these links are hosted on compromised content management systems, increasing the risk to users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://thetestmag.com/userfiles/files/9292950232.pdf In PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/biluforiverejogol.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160765f811f41d---23411218393.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/56958473670.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba352612968---numazoxamur.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eab15500ce---23546911913.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/zexalubomojizo.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/rewepajobepumeke.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16080fa1ee9adb---78783437416.pdfIn PDF document text
    • http://oinworkshop.com/clients/6/6d/6d9161a7191ba42f41383a85782e2f4f/File/japotebedejufu.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/jizidusudi.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/5f2240347d75f6ea9a6d6e4330d50d88/49602860351.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160a594e7c1e37---jeforezizaloji.pdfIn PDF document text
    • https://luminex.pl/upload/file/sipomuxabanixoxakik.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/br6ta0aoiasnakfs5bkch70bd2/64342218166.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c895ae1a962e2181de334d0112701f4/biduwitigelife.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/jebaxos.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/bupuwidinavofozifofa.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d115767ac1d48117aee53881964cc171/vosozofovaseputeguretukob.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/janawiguxesuzejenalajet.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/34878333b520a358461aae212aa60b56/guxapez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=clash+of+clans+best+th9+armyPDF 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_off0000f2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD4 17572 bytes
SHA-256: 54ba309f0d938e7ec490a64316dd35202db2bd81c53f0d77350f482770613280
font_02_sfnt_off000138f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F7 10964 bytes
SHA-256: ae0415ca42495a3fa70c4144f072785f80cf3501d8a5927785ebd01bfb4493c8

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