Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e7ab5fd78be9474…

MALICIOUS

PDF

91.2 KB Created: 2021-09-01 22:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23625f8255902555d7bfcc92ace43dd7 SHA-1: 1142244822985212c30b5064f8c7f6e5f5f859f6 SHA-256: 7e7ab5fd78be9474231e11bd1e34cd7ed35d2d21d9b3f16b06aa6d2aeae02909
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URLs point to a common PDF-based redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=army+corps+of+engineers+florida+permits
    • http://ediljolli.com/userfiles/files/65018258837.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/f74bd3bfd4432971bd27b683f74b093e/loxulesa.pdf
    • http://abwmarlboropike.com/uploads/files/kutamelibegew.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16100256b10b41---29526935824.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/e409b0b8a960da76873092eca8109c88/sesubu.pdf
    • http://chickendaylacrescenta.com/uploads/files/31739541442.pdf
    • https://bawauang.com/contents/files/tekakunu.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080076782af2---56679021513.pdf
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/77978216422.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/1lj60e2n51q7ctfau8d0mo22n0/topubozapukirevamawus.pdf
    • http://centroolosprato.it/userfiles/files/dexukujuxesetiwi.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/300ad1et389l0anu36e8264ire/genud.pdf
    • http://chocoenglish.com/_UploadFile/Images/file/60957251522.pdf
    • http://apricomm.com/userData/board/file/53572478263.pdf
    • http://yokohama-model.com/userfiles/files/tawuguvizejefikorogulul.pdf
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/83709884188.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f761ac9cc46---betomedisawanobubax.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67d68bef80---mikabela.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7fce1e8ae---zesafemusozu.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160869ed52ee3b---mafelaje.pdf
    • https://beldapin.com/calisma2/files/uploads/jefekowiwa.pdf
    • https://xuantruongtech.com/images/ckeditor/files/9747848913.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/7d746751b33df00685584994d74b2592/risipopew.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFF 16792 bytes
font_01_sfnt_off00011511.bin
ca5564086ed4a1621c4da5f2c77e018f8b985a01970a1eac302aab7baab114a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11511 17704 bytes
font_02_sfnt_off0001433b.bin
d8dd8cb3b77236e90ecae49862e17c5111e8011b208b9b53109197a34e716714
pdf-font-stream PDF embedded font (sfnt) at offset 0x1433B 11056 bytes