Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6dc3c70aca8340…

MALICIOUS

PDF

85.4 KB Created: 2021-07-15 13:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5779a8707679192ee6e46bd6c5618965 SHA-1: e9aa0b0c07222f02c718cd3498a1eedc75dc120c SHA-256: ec6dc3c70aca834010b70d9e6a247f5d992a5b0a013e2913dd0002561ee12fd5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised or disposable hosting suggests an attempt to obscure the ultimate destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://rubyyadav.com/nbloom/fckuploads/file/57714265155.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/2c059212a06778830e48d38f4775f824/tijedufotukuketupaw.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945df45e916---nagegabusivexejo.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/24ba58ba8c46eb6323cd19d29c68a7c6/30130037195.pdf
    • https://sayurmateng.com/contents//files/kejibipesixuforur.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609820a233a11---tipegarutufezipi.pdf
    • https://clifestyle.net/uploades/userfiles/file/66531529907.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ed81c21c5---suwisetatisof.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607be9535ed3f---rajetuzusokafexomitozuto.pdf
    • https://twr1115.net/files/fckeditor/file/665547747.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/3fd32a4c48d86613fa2790ca7b42da61/87700121461.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160913e2ea77f7---10237656196.pdf
    • https://lasanisports.com/files/pesopefanasewusemoliba.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/ridolafoxip.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/c5644910eb615d8829515f693f769a33/27232969743.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8807e6cc64---32306939848.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a07cdde0a8c---54301016791.pdf
    • http://guojingmall.com/userfiles/file///jesibetiti.pdf
    • http://busankid.com/webfiles/board/file///33369246476.pdf
    • http://limoride.net/gallery/file/wobanizur.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077c71773154---kinojesujukijez.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/f3e4b436ecaf1668029037e01976b2ae/26990828920.pdf
    • https://mariellatriolo.it/public/file/37988902905.pdf
    • http://asja-doll.ru/userfiles/file/85693104733.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/6vntblje35doidn7hbludgpjg3/puwoxovele.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=2+factor+theory+of+emotion
    • http://s292376414.onlinehome.fr/datas/imgmail/file/kidepedajosufigizu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed5f.bin
c05fff7b953d26dc50e09efb83ee8cb0564b57dea70ba21d07273870be862d73
pdf-font-stream PDF embedded font (sfnt) at offset 0xED5F 16560 bytes
font_01_sfnt_off00011884.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11884 16792 bytes
font_02_sfnt_off0001309b.bin
dd59a23100f3fe92c181f3e4789fbc7daa0898bceaef8144b6fd5139e89ca340
pdf-font-stream PDF embedded font (sfnt) at offset 0x1309B 10524 bytes