Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae9a6746b82c72d5…

MALICIOUS

PDF

83.6 KB Created: 2021-08-29 23:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d966c0676bcab739d0a15e438454c0bd SHA-1: d0b7bcf9a5a5b6074296bdbcf86158c1af6518c0 SHA-256: ae9a6746b82c72d51054e1c42135885e9ed4f5b32cd76a9932102bc43edfcc2c
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 multiple domains, many of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or redirect them to malicious content. The embedded URLs suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/sfm0672p86sppf5euqm540pc49/57066101343.pdf In PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/81583314735.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/952ff9f183d720455c1fe93e38648907/pubepefidosebadaxolu.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1621393494.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/sazurupevejisesu.pdfIn PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/vedinomowarapebavekutedo.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/bijaki.pdfIn PDF document text
    • http://konyaozgunmobilya.com/userfiles/file/81870939277.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/35298734645.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/vl5usj58buohfaas663raott90/koxeluletorirozazut.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/80202972623.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/48879478602.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/12051518869.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/93847570599.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161188d0b01d2b---68497939530.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/p40d59e5rca3f946oc35pg4mek/fokeza.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/62817188677.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/76759320176.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9fb08f0d3689a450f243d1a357eb2737/99345717996.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/1fe1b65c45135be6cf18799673115e94/82910163278.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/leguratube.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/1f43bfa321ce564e4f613b496dc3d030/43265570380.pdfIn PDF document text
    • https://togeltop.net/contents//files/laferonezowepaxepiduz.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b03b308e76c---wosepolepitilulopenus.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/98595642657.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9b7e6d4f7---21567213464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=rss+submission+sites+listPDF 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_off0000e44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44D 17456 bytes
SHA-256: b2220e9022e8183e50e7ff17350eb511ab81ab64a4a3939052f365d78dbda54c
font_01_sfnt_off00011166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11166 10292 bytes
SHA-256: 2716e782d216727678cf6b4972c29fe438eba8d686ca5d45aae9aea403b0bbce
font_02_sfnt_off00012891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1