Malicious PDF — malware analysis report

Static analysis result for SHA-256 03abe8f08b2fb8d0…

MALICIOUS

PDF

84.6 KB Created: 2021-09-07 19:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dfbebf133ebc86a1cdc1c793e28fa651 SHA-1: 7c22868e89795ed5a375d9d97943eea76480df02 SHA-256: 03abe8f08b2fb8d0b40476923f0315cf79bde3d684cd93db054e2cf8cc43994d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to unknown PDFs hosted on various domains, suggesting a link farm. One URL points to a compromised WordPress upload directory, indicating a potential distribution vector for malicious files. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the link farm and SEO manipulation attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://spreewaldatelier.de/img/editor/file/38844329829.pdf In PDF document text
    • http://thanhcongtechtra.com/upload/files/vugofibevuzufata.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/jakegaf.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/85432094174.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/8363152641.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a627399ab---55318278301.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/fageguru.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec05878651---pipujosof.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/80483677569.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/72815528038.pdfIn PDF document text
    • http://seritour.com/rsm/files/jejawipupevunubemina.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133425445193---nejufo.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/8e90da4d70a7a93bee7618a4600959dc/78558027316.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731e6129282---xukejage.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7659e5f9c---fosejuj.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/vivuz.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/98723f0164c8bbbada714d7fd2df15bb/76853278963.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/27972110152.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/44176390060.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/369c3fnao7v3bvm4ht8cqb441q/bafedexivuti.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/bf96231caaca0af29de9a7096b82128a/11911796002.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/3o9e4mj161f37k2das863u061k/titixab.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/f65ac6d423f4efd49eefe2118f83f135/dajexilokebojidenetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=commercial+kitchen+hood+design+pdfPDF 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_off0000e58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58F 17772 bytes
SHA-256: fb549802a4b3d1543deeca084f9fb41caeb17bb2c23773b8157f3b1de4bad929
font_01_sfnt_off00011347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11347 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5E 11192 bytes
SHA-256: 8aa99d7835ec33db65a56d1a4b67b2a45aa1269c13fca79465a27fee6b6e228f

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