Malicious PDF — malware analysis report

Static analysis result for SHA-256 67aad3c553423861…

MALICIOUS

PDF

86.2 KB Created: 2021-09-08 03:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2793132ae32cc6930c1cdd61ee099215 SHA-1: c6ef55b53f8ef16950cbcbb52814e1c189a0d867 SHA-256: 67aad3c553423861c4fea65db886fef5e5a17e37902ae357492b99d0242104e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm with numerous URLs hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the suspicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/071118057c1a909909200965964b271f/vefarazixozigesedizime.pdf In PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607668da51144---89618648545.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/75752654180.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc81372d1b8---vofexazili.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/janobubarotopijogamibafe.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/b6f6d8ebc80309548e0cc5b899cbefe1/duxulogafobogotowi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843f192f5af---19086674282.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/4d349051480408a0cf2efa411bd57a8c/zukedebaxid.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/41181417988.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/rsl2v83sea7eeq7vt52go4j3i4/13178736323.pdfIn PDF document text
    • http://barnesfamilyre-union.com/clients/52050/File/29645444903.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021072016332370554.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/foreduvafozenuxujumatix.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/nizuwiguxegalujidi.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853b0ba4941---93851172852.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610308c8166bc---fowefanelikosan.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16092b8f094bdf---18601519115.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/3c86815b3be096e51413f2ac5fc85478/bofidelupi.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/11562839333.pdfIn PDF document text
    • http://metallpress.info/files/27164730051.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/xulepopavuto.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4a8b22c06---86191660683.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/nh2sss20g1iqai20n5kd0esqdq/demasitofipixalubaxokinus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=madras+university+bsc+computer+science+question+papers+with+answers+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_off0000e6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF6 11484 bytes
SHA-256: cfbb118f1cd560cee38d459b1e69d7e464ab923b6e78ebbd3aa53237dac2e2fc
font_02_sfnt_off00011996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11996 18216 bytes
SHA-256: 0fc59c2ac4a5a3a3aa71e8b9fc0fa28425f35c99dbb8a343031295ea4c81cd44

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