Malicious PDF — malware analysis report

Static analysis result for SHA-256 781bffd62917fcd5…

MALICIOUS

PDF

84.6 KB Created: 2021-08-07 02:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aa148bf9c688576c1ba0e944df717624 SHA-1: eabc1f3f95c5d194923b9ad589ed011aab51a434 SHA-256: 781bffd62917fcd5f9faa0ed12f62bc6f05cfb1aebbc631325aa0fab15d6532e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://ikuseikyokai.jp/ckmedia//files/65781854571.pdf In PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/af1jjiftplc48o5n5e6s0ajdd7/xilado.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/15222968096.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/46523847381.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/88214507763.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/jiwux.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098b1aaeb7c2---segafiwo.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/vekev.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f97111b6a5---fupaxeretoguzolu.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/6a6dtn9rdi6bvtha28c61j47l4/13972719441.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/e84d26201fffa5a3d017434644594c10/7637072860.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/36180611743.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074034030072---pimijozajewepebuni.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e252053b0---96855387482.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/19a9e7a129952d1363e96a75682506f7/nabapujatovifomuwosafoke.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/36438368970.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/550648b13c7759eccdf6aa3d9ddb0a68/jejesimesabizuzuwo.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/3pt722kds2bsm2teno4hj4c1u5/gokobawiputuzikesisem.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/f72bv54d8usb9e1ttsmd6dichf/sunusemuzinesoxudu.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/97939847015.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/c6d4bc4c276e18e95b57c0e6550eb16f/safofezozozenanazabeje.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a58b6978d24---77472089504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+calculate+pension+using+excelPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/55008115337.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_off0000e195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE195 10728 bytes
SHA-256: b8fbec38aa9d1828453e76df736d7fb1abab58b99bebd04d9c7aabfcd3e1b14f
font_01_sfnt_off0000fa6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001127c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127C 18660 bytes
SHA-256: 7cfe1b998bfa79703480758ea307000c24af677f2eabf16c98e0a82ccc0c4dfc

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