Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2a5baada3d31e92…

MALICIOUS

PDF

81.8 KB Created: 2021-06-30 05:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2b6b39f406ad23d7d2445188d35edd22 SHA-1: 3adb477affd792e1fa0dd963c04010d76d796a6e SHA-256: d2a5baada3d31e928e75940126408d0ad2acb3a98fafcc8d67ad64057618b0a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised WordPress sites, directing users to download further PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to trick users into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/01d0fa496326cd6e031ba56de86b6b53/rikagasod.pdf In PDF document text
    • https://angkortaxiservice.com/userfiles/file/julabajufizuxesajuxelopef.pdfIn PDF document text
    • http://gdgom.com/upload/file/2106101235277783982klj9mdh9t4b.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8007c6952---zilinaguka.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/29821553209.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/8bf1fdc5d409c67a9cb13b3cc99353ef/79683009526.pdfIn PDF document text
    • http://pronobile.de/catalog/file/91228258873.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608737ba87ec2---38613165173.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6fae9030eaff162f3df07b28d4883cf0/nutugefinamabefe.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/fc11e015aa4a44e43d4e62f69840b48b/xabefunepafuja.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/197331ed27e1729b4bdf74cda03cc086/34731847947.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210626_03380A2326863F53.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/a5285e9265323dc2c66339fc23b45e82/fagoreluwopudopokozogebuf.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cda07c93b6---tewijinixozopejuxi.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/0uea4cp6m0728sp60202cm59g6/4661587443.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef27cad65a---bisusemako.pdfIn PDF document text
    • http://zzweien.com/d/files/joralet.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5311a77b8---77118874188.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/b8cf4ecd0de2d1937643c841f1c2c264/48668589384.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/83497590737.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/a0gv95ikkqvnil5gukbq83m84m/xemezowomegulixe.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ced10b2fe3---48787660600.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/84a217ca21281ad51997f4231e8df52d/50704433918.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/8f9dcc0e448f1d9e7ff343ff15ec01c9/xudeje.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a926788c80a---82224984848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+draw+cartoon+spidermanPDF 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_off0000dba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA4 16928 bytes
SHA-256: 9fa67912821b7196c9424fb80af30b55e22209f55d88623c8717f5b817fb3661
font_01_sfnt_off00010785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10785 10708 bytes
SHA-256: e10b83325698ca9f365fc6f2e879c30e40b88b3f17287c00ca74fb1bee1b4ef6
font_02_sfnt_off0001201b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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