Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a381f690f801fc…

MALICIOUS

PDF

97.8 KB Created: 2021-08-21 20:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d541911ab79a15280b0befd0476f500f SHA-1: d611bbf71d5ae6bcebfe14e0894ebca53c1c978c SHA-256: 40a381f690f801fc29d0857735a797514ee4f61746e9962f7e60b061ad181c74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the heuristics and the presence of many URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=what+catalyzes+the+formation+of+the+peptide+bond+in+protein+synthesis PDF link annotation
    • https://die-elke.de/cms/elke_page_files/file/83782514009.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/naravop.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c248c19438---megazozixolelavogozipewa.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a12dbd9937a---27772787004.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/625bda8e949944a2d6c5b84e52265e88/xomexo.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/s3k7oak6lc5u7vu3tptuuubo7b/8233295948.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cda65d1be4e---12225139622.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/fokowuzifonosigagufuro.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/63473717780.pdfIn PDF document text
    • https://hurtowniaroza.pl/upload/files/jisafajajebibu.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/pavefuzalozisomatavix.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/soxizigomozutuxap.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/26026544066.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16081bb4dafd5a---tipififoduwuninofere.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/sogakaxigixurinemazu.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/xitobilisanuwiserev.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/8b40138c5487d57ad9fdcb6990d54047/venarobar.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/e2de905e674a1b7e3b1eff50a701300a/29028630309.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/68547536921.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/reroxekeroxiw.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/3440531897.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/fenoturitaxibamejiwuvugom.pdfIn PDF document text
    • https://argumentua.com/i/file/bivutezo.pdfIn PDF document text
    • https://wagaskar.com/media/52096341560.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/43487103430.pdfIn PDF document text
    • 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_off000118f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F7 16980 bytes
SHA-256: af135be2336c406e2cdd34eae2483d833d36348ec0ee4ab4d505b3f1c478c12e
font_01_sfnt_off0001454d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1454D 11192 bytes
SHA-256: a429cc889055598df9a2e421409e34b2cf9312ad96984f26a486509f59c9c82c
font_02_sfnt_off00015f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1