Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d91c6c9ff39d5c…

MALICIOUS

PDF

81.7 KB Created: 2021-08-16 05:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3d3755b52f8011145c55106fc4187b8f SHA-1: 8f77653cbd06c279b831ea6e5cfeefd1239511d7 SHA-256: f8d91c6c9ff39d5c4f8e1a6a1b1578c61c7d186f73490dbda36d0ce91ca13ee6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms points towards a spearphishing attachment delivery method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.nachtruhe.info/up/files/pukumekod.pdf In PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160942b8ebdbc4---vekomadogarazufame.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/31510137685.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc17eb8578---gonawitafa.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/bunojulawes.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/diwak.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a32333ffb---jepobolotuke.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/71011863429.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/zutelab.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/bowedufagosizotinatomini.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/damuzotadofakitagatexeg.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719bd43d7ec---nukilidipifelinogajigepa.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16079fd3440ba4---kavemefugusi.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/modoji.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/64397500606.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/ffd554ce99b0f8818c1abb22d5bbf2c8/xasudegokimedosit.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/4647454982.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///kovudubamixiraxujumobumi.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/c4n52f3ak38156e3o4kulcrcvn/mimavenoji.pdfIn PDF document text
    • https://schmitz.cz/res/file/jodijoxufumevorum.pdfIn PDF document text
    • https://jagamimpi.com/contents//files/wamitudoxifuna.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/33vk39a8c4ekf7riududdi04ti/9606133150.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/7e7ff6a3259ca1a8ec8d221b35edb5c1/91223439716.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2ffec180e---35364076386.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926d4ac83c2---vexirijefipadokod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=is+there+an+accident+near+me+todayPDF 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_off0000dde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F4 16444 bytes
SHA-256: c28a536a60664801a3d81a11720fbe073c47958544ba4aab81519cea90dd2778
font_02_sfnt_off000120ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AB 10656 bytes
SHA-256: c16570745febd4450bd40b3afc712917a9283260bcdad6a0306bb5db78cb2882

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