Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aed48eca8eccffd…

MALICIOUS

PDF

85.6 KB Created: 2021-09-10 21:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4eef1d93507f37809e425e6c2e887a41 SHA-1: 8ab43196f743f038cba4521eb884251618ba1b4a SHA-256: 6aed48eca8eccffda395a60ae5f5c4fa6de583d6de58158a69978481af5aef7a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The primary function appears to be acting as a link farm, redirecting users to potentially malicious content hosted on various external domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://baocaosudanang24h.com/uploads/image/files/jorunibolivoni.pdf In PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/98228870093.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/bomipamamol.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/2cca65bbd0f05733c5c67ca814e7b839/64833662095.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/50586487615.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/1905347963.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/44411623455.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/95815569693.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/62591764121.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/wewisowofefijoxunenun.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/bijelipur.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/nizonasa.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/9796185024.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/88643118785.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/47381062686.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/9ff7cbd8dd3f92f20888ecab8726fd9f/xufaxibe.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16130d22d28848---66351542651.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/gixogatekakobe.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c93f8d8ca---rebiwuvijisedufan.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/77156382770.pdfIn PDF document text
    • http://sayarbobinaj.com/file/geduvidebusutiralawupe.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/aef199ee035d2b4b97aafddf6a6af316/wilofobigumin.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/zatefovolivuze.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/nulesososefurako.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/60185a0703283a1a90853c4ea38541c0/72372308539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+should+be+included+in+an+eportfolioPDF 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_off0000e8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E0 17620 bytes
SHA-256: f3fd46d66bfa34446c4ef6cbbc35cbb202458dd29322ab38847863dbfcf141ae
font_01_sfnt_off000116f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F9 10948 bytes
SHA-256: d7bb8d1b597ad199a760a02c7ca26a3b4b6481dfd16a24355fb33718297f4efc
font_02_sfnt_off0001301b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1