Malicious PDF — malware analysis report

Static analysis result for SHA-256 f091b48db308d5d9…

MALICIOUS

PDF

94.7 KB Created: 2021-08-16 11:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 16aac0b30ccd16bbd0d55700732cb314 SHA-1: 819a701f7869313edc3ccc7de431414eff3670e8 SHA-256: f091b48db308d5d9632ad58a72a9144b2d7c0162f50725ea540627a9fbf83bdf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or contains malicious content. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and a link farm structure strongly implies an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://magyar-logyogyasz.hu/fileok/file/24772184718.pdf In PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/be2a676277f2691885f8bc7323bf5cc6/dupudirunorefizerupaw.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/06frsh6m8tkl132bf7fhlgop85/18495606729.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7c683dcc19126bc162c215eccd5d06a8/durewosenavademezofufadu.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/magiked.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/76422778003.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/tgt1bsaomole9h77tvondqv2jf/paninirewefimavisavexeb.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/17449794085.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/67751903652.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/15df31fd171b7d862a67983bae345c80/62888326048.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/5b6bf0e47cdb852d77ee42d70d85179a/24989703490.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a952e176b58---19498375679.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/62006648053.pdfIn PDF document text
    • http://palami.by/images/file/rezogixobikanuxulidexas.pdfIn PDF document text
    • http://valaptop.com/ImagesVA/file/zudisurezun.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/90723198405.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161180fb97fc02---68281679029.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/lozivuxoxawomika.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/66346124191.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/mevaponabufipem.pdfIn PDF document text
    • https://vendax.ro/files/file/40479243335.pdfIn PDF document text
    • https://faceless.me/userfiles/files/36225702755.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7446f0b2d9---45549184464.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4645c399a---29583209033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+consensus+and+conflict+theoryPDF 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_off00010f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F15 10780 bytes
SHA-256: fc8d22af63b46dfe5c578d6f69d0364a9e0d62c2dea5a4cab963ba313ca3e7a5
font_01_sfnt_off000127e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFA 17192 bytes
SHA-256: d7802d0a54cd4cea8b45aa27fb9946b4682eb84c69b4ffb8bc1cabfec9561175

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