Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade934c6d062a1f2…

MALICIOUS

PDF

87.5 KB Created: 2021-08-22 06:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 965f49a02540e26ce1f1f4310ef1412b SHA-1: 65b26f3cdfae6e7fa8f65b0a02c08c8e89811d20 SHA-256: ade934c6d062a1f2f9c8fa0755edbb704393834e7b5ccf94ff487f23e8cedbd2
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The PDF structure and embedded links are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://sluganarodu.org/userfiles/files/pupetuxiviz.pdf In PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/lebof.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/59961530772.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/68120105721.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/v09gg0tt5ij1c28g60ibkj55fn/66042003719.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/34992683378.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/badifutiwo.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/suwotikupepagabuseri.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/70b1180e60e7832d82e02e0057b4a259/22405836324.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/mefurivebulanobow.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/g15g141veb7kkrndl2u4le9sb0/vegefebiwe.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/1746bc1de04dd9a8feb5d80da47fb34a/83595293120.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/tbn9ornl7q72ijl0jbfaeh5ukf/sepakererinoxulowopusolu.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8f6d09c8d---35044483484.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/74247660721.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161062c7373e86---taxarijezitegisagasidot.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160933c8f84c61---tiluloxuxapil.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/59758511673.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/59714767932.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72813215929.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a0b74549797bd7cbbefe894ebbc8c49b/mezuzevesajef.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/14602962019.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/f89f3adf73cef558ce5c1db3aa4ad392/gasidedetafusetuj.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/21308445717.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceffe66780---57230180688.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=chore+suggestions+by+agePDF 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_off0000f205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF205 17332 bytes
SHA-256: c5b4c3bc892a37274bcc78adda95abc47caa1d45684c3ca2df99fd47f4728982
font_01_sfnt_off00011f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13727 10728 bytes
SHA-256: 15ae1a17344bfc5280f80f54f4cb420f9e63988e6ae2ae167189962ab8a2ad32