Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fafd982351f43a6…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 17:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 365b6b73e4b6b3210f60f59227535e1a SHA-1: 2b9fa171077dc0571c6a9ed2a1ac92d4e6e3b4f9 SHA-256: 1fafd982351f43a6e8616a725408f14242e36a516140243f4190197731212404
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The file's metadata indicates it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://dinskayarealty.ru/media/file/30638269021.pdf In PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/73001338699.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210917144517_88546887.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/35382334404.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/83646513697.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/56201060008.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/72101320606.pdfIn PDF document text
    • http://getdol.com/page_data/file/tujebovusigisamux.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/xodokomipugakidupigu.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614407be7d5f5---liketen.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/kikilagobanonomorejamojag.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/hmpcvbmcahfs976vgkc56t41b4/winogugusinuvilumu.pdfIn PDF document text
    • http://anpharma.net/upload/files/kogumexiviti.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/farosituribigakidezowudig.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/4157562556.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/rolasenegakijeporiwak.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/nokoribanedovafi.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/pomamunew.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/sefararilojikusaratakit.pdfIn PDF document text
    • https://ebooksweb.net/files/file/28451983909.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/fefoluxuroxovel.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/8209294452.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/xelakazuzofumopix.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/wapivemepudegetixil.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/hbp3fokooqefspggiii5pj94ec/6912108860.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/940c1c3a7f66ef3ea16a81e3e132446e/83630625945.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=naruto+rise+of+a+ninja+free+download+for+androidPDF 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_off0000d2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F2 17264 bytes
SHA-256: 4ca9c37a8e412c873af2acdc41ec44a8a16224c4585fbea8107b9a487d942573
font_01_sfnt_off0000ffc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D9 10640 bytes
SHA-256: add04b424c9fb8b39c36ec82bfca99683c9990bf311b19275b9fe1c80cbf01d4

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