Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbcd7f722b74efa9…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 11:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: dbfa18d4f07302ea5cfa456bda416b90 SHA-1: 1f817d010f55b646b9e80e8cb418bccccb16d402 SHA-256: fbcd7f722b74efa92eddb89ab529dffbde6d0ab1726d0b779f380f1942e0f3cc
164 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5692

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelicanfinancialnetwork.com/ckfinder/userfiles/files/84512711748.pdf In PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf1d38d4a7---tegajoveperibubeka.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/60733608043.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/duwasadazowid.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/rusodumojaxule.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613944cd2d78f---mizawejilenopar.pdfIn PDF document text
    • http://citranco.com/users/files/69582860641.pdfIn PDF document text
    • http://saktigroup.in/uploads/31996138387.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/61386043604.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161301b40374b1---13125532783.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210911212923_3i1gbz.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/vabovamelolasadokikile.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/14800125146.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/26001172621.pdfIn PDF document text
    • http://fourfoods.com/images/files/5154235940.pdfIn PDF document text
    • https://combrooncom.com/contents/files/vozunuzubixulil.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/livalosokolajafejexazevor.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/38247637903.pdfIn PDF document text
    • https://bunianco.com/other_files/File/biwugukuvilalenanavabuva.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/powujosuxuni.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/96659638418.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe858f0b01---getexufiwogekirageg.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/14818921900.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/qiopaav30911hsech5h97pt2c4/ripapuzotatoziwanopixol.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613478fa5982e---jometuragawibedofozotepos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=premam+movie+download+in+tamilPDF link annotation
    • 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_off0000e616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE616 17256 bytes
SHA-256: 206d68a3944c0b204024d653b3bcdbdc969aa985049d8bef8295aab9812eb8ba
font_01_sfnt_off000112e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFC 10392 bytes
SHA-256: b667bf0d1dd23a3f076fd595bbe221b4904930483aa4f8c271834ef5e43e31f7

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