Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb09719c340acae…

MALICIOUS

PDF

83.8 KB Created: 2021-09-07 13:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c6e10510a816ac0a7ffc20277440ba60 SHA-1: 21ad322a0a5ed31b1f3451642acd4d3bb9cb086b SHA-256: 9bb09719c340acae3e34fdb6373adb041db00fb2c33369028d1c6353cd50d28f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=headless+chrome+print+to+pdf+not+working PDF link annotation
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f93bf5420777c1f6bebd6b355574d690/2107040918.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/kelowaz.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4267e289db33a2881e6cad8023e361a2/gokatitakidofuk.pdfIn PDF document text
    • http://psmpetcare.com/clients/76030/File/46333876245.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/gegavunebe.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16105bb7316a51---24760847560.pdfIn PDF document text
    • http://maksimetall.ru/files/dimemavude.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/83368011696.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/mcpqdnhrnci95s5rmd1eu4p491/77277702778.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/80521248061.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/3f600d4136a36691e0394d54ffac471e/noxuse.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/59672565821.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/26626768496.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/juvazojuzulilokovotap.pdfIn PDF document text
    • http://agama-rc.com/upload/files/jamirafejofovupepun.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/xorizokukewog.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f282f0986ba---80062883240.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e42edefc72---91788431139.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/83406039752.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/vemuvajad.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117e447ebae0---76426754108.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ebafa91ac---jufujabesaninumowiveji.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/wevawosamixotawosad.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/7f278e1f7d8773cfa4af27bfd209d848/73622208505.pdfIn PDF document text
    • http://adveotec.com/img/file/60695113899.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_off0000e0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B8 11236 bytes
SHA-256: 18719e7acdf64f52a19e651681c9340b0d828539e93b44dfc646d9d42a097054
font_02_sfnt_off000112a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A7 17692 bytes
SHA-256: 010f252a86599439b51b41f1b214325452c5509f99c9c12a76a97d75dbedc75e

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