Malicious PDF — malware analysis report

Static analysis result for SHA-256 f197a348cfb72fbd…

MALICIOUS

PDF

97.7 KB Created: 2021-09-02 01:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a82d44717af6c9807918b58c7ec51848 SHA-1: cb6fd411e22ad085721c0b24e5b91e7e5824a170 SHA-256: f197a348cfb72fbdace070b39a6c5a8b60caf5f1cd06c00f21f130c9523bd882
156 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 ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://catamma.ru/uplcv?utm_term=brother+pt+1280+manual PDF link annotation
    • http://lingeriedediva.com/UploadFile/file/2021081710565673499.pdfIn PDF document text
    • http://casabresciani.it/uploads/file/43335650201.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/77245710875.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c12f729ee---xoxetojofeka.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/1518c35491afe759bac2298ddcff022b/68388473902.pdfIn PDF document text
    • https://tavio.ru/files/file/20212423599.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707daf1cb32---18034742246.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/jogogoxukone.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/75130504494.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/535f6201f85b7af6022d1abd537a995a/budojutimibobixuwi.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/ginerivelikufijomiko.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/93570404866.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c4d4bb671---fafulu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/97c7ecae643c15e098774100f868caee/deliruwexeg.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123b2dcdedec---norerixujimajotexowad.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4a8d9ec62---rajosapixelotofom.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/rimamunuletuwim.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/39096574826.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/44fdce5b88ea517366c54576dbc58440/menetozetoxezefuned.pdfIn PDF document text
    • http://www.farnostbobrova.cz/ckfinder/files/puzuvizufez.pdfIn PDF document text
    • http://merwepizza.com/upload/file/josupawave.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/5266083831.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/banokopegujo.pdfIn PDF document text
    • 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_off0001155e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155E 10912 bytes
SHA-256: 6863df3270aac8186740ec462b5e59e52b2b827c51ea8808b4e06a1a8cc8209e
font_01_sfnt_off00012e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E91 18612 bytes
SHA-256: a63a0a95124cd71cbbad347fa6d56d6c0843f53ea2c04f787d464bb25342a16a
font_02_sfnt_off00015ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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