Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbda6afcf6f98b6b…

MALICIOUS

PDF

76.7 KB Created: 2021-09-27 14:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 074430ac4844298d2d346df2440da2e0 SHA-1: 9c705567ccf98b53827a0c635a21e70d1574ebec SHA-256: dbda6afcf6f98b6b19b8b299378aac20cfdf7d554e3f8e5fe8844de8c69cedc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://svetplus.com/userfiles/files/72639642900.pdf In PDF document text
    • http://studiobardinisrl.com/userfiles/files/46820749046.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/dabezuwesipigiv.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/48300410836.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/98734185486.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/48240534522.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/37086594032.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/71677924812.pdfIn PDF document text
    • http://ihdbd.org/upload/files/pitizafemufofolifuze.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/69640386276.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/56758328279.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/wixefotin.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/jepivomolinanodaxi.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/58909496489.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/35628818185.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/kibew.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/46964394607.pdfIn PDF document text
    • http://leeandrewdavison.com/download/27221084400.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/boxubejuri.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/6j2cgs7t2nntikh3u97b0hsovu/74920595070.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/6032534892.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137621a63d11---37349660679.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/s2vvh6ojid2o73tg4s3c8svdn3/fuvoxopewazukarem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=az+recorder+free+downloadPDF 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_off0000c1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA06 10240 bytes
SHA-256: 4574e1c70f18b3b29e6acb6128976f2b6abe2a32104dcea5bdf6ed48764ec48e
font_02_sfnt_off0000f13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13F 20308 bytes
SHA-256: 6d4366cfbbda7c3301318dbb51c9eaab27ba9ed04c57467ebc405d2a88d9df74