Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2aafdaa212fb16e…

MALICIOUS

PDF

95.8 KB Created: 2021-09-04 05:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 45587683882527ca49f5b036c23d6ad8 SHA-1: 89c1b6fa9ff2261a160c904c027e5e8698bdb2e0 SHA-256: c2aafdaa212fb16ed11ff13f4ffd0247b4e8f562e0e3f9d872f17a3e77e7959f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://amatnieks.com/pictures/image/74917673642.pdf In PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070b9e4dd135---26657238063.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bee808b5bd5---89387911052.pdfIn PDF document text
    • https://aashianarealty.com/file/8458322353.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/80029839118.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lgbmgtcrdkhensnjhjai1o7j50/bufavonojizomado.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/tojisadolokasukipezit.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e0f0041a---danomi.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/nilomotogede.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df5912ec4e9---33317539981.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/suvijupogitijijakosogetef.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/guxotagiwuvaba.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/pibus.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/15274544232.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/drtt6e3djt90ucb64olh67je45/11230129547.pdfIn PDF document text
    • https://marijina-romarska-pot.si/userfiles/file/54558180846.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/3988823022.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/7ageoj537mnrllt9ijmq2ottn0/suvede.pdfIn PDF document text
    • http://ciskmv.com/css/file/surigene.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/wuxarabosibufebow.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021741655187302.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607964dc41543---jofozu.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927fff99177---52777579975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=business+writing+today+a+practical+guide+2nd+edition+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_off00010c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C39 19320 bytes
SHA-256: f3635a84cdab2aa4b9212d55cd42e9cd46fa7b2bb08dea8d0fbc0dffe4f57f41
font_01_sfnt_off00013e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E81 11268 bytes
SHA-256: 77733fc49e545f06efd011865f5c11099fa9f431199c8f67c4bebfbd3b4f5835
font_02_sfnt_off00015918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15918 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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