Malicious PDF — malware analysis report

Static analysis result for SHA-256 d46d1ed740d52779…

MALICIOUS

PDF

71.7 KB Created: 2021-09-21 18:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e16d7916d0aee9f91c6034dd3d51da83 SHA-1: d314bcd06787fddfb6e6bacc3272f9d32c634cdb SHA-256: d46d1ed740d52779070d1fc503e3bb06c560d7337f1c9d1ed59a4d5e25a95f3e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm. Notably, some links point to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://le-lemniscus-incandescent.fr/ckeditor/upload/files/57663847590.pdf In PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/31463409245.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/seregafigekupopabul.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/bozagojalezejizoto.pdfIn PDF document text
    • http://entrackintl.com/uploads/pakepugitegesejazofegupox.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/kepepiwumitomi.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/fasepizi.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/1r340l35dbvjsccugqobhr8mu1/52355150547.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/69813907963.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/zomibuwujidemajubaz.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161493fbc270bc---jizetumazemipupepesu.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/13138480382.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/satenojuxidenepetupiguve.pdfIn PDF document text
    • https://venus-forever.com/image/files/24120416116.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/24397862505.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137df578569b---23352178911.pdfIn PDF document text
    • http://aa-nusd.jp/7654716824.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ut0f1aj7fhkvvdh48pc7msibk1/peramujamafulusovu.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/bukogubewikawed.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/50084888362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=black+butler+season+1+english+subPDF 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_off0000b5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D4 16520 bytes
SHA-256: 18d9c0304fc185104e1871382fa5a40272190ff03298addb1784efdc74f234d5
font_01_sfnt_off0000e01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01A 10944 bytes
SHA-256: 6a73fc1b7aa4f875d9a83b9b5c901f7c24397425e5ff4f07f38d688272946522
font_02_sfnt_off0000f987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF987 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1