Malicious PDF — malware analysis report

Static analysis result for SHA-256 48299e6bd751e37a…

MALICIOUS

PDF

91.6 KB Created: 2021-07-05 03:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 39dc3d040d95e3ce6bb2fc4672bbfffd SHA-1: 5ccd5118c3212b433d7175d4c4117acd35321ae5 SHA-256: 48299e6bd751e37ad4d5794a4a5fa0b33e5573a958fa8295c2a254651ae6fb0e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated, preventing analysis of its direct content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/1910a167b6e83b98aaa7e1a79e69411b/lamezosozixanama.pdf In PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091d0acc9685---xorex.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b89782ca84c3a14d3b69208c26f26dcf/17721126346.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/47490426092.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/22409181853.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/27584361266.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/zojufogamefa.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb83b3920a---nejasugamomibegaw.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bede85561b---kelawokoxafikazif.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/mepafusoxap.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/32906253787.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/95a3cb48597da7e684b9bedc9d4be900/92834309851.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/46222163183.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1a18d1aa9---wijukukotitubemefasi.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/35fugut2oi55pmc8qnmolh6v82/pezepikapifimuv.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/63728059453.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c9ee3794055297d2ab44104ca1f1b6c1/82928857104.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/r0se20b5s9gsje7lvks76qhfj4/96241021526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=meaning+of+the+word+tactPDF 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_off000104f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D08 10620 bytes
SHA-256: 335b9ce781ade111141bac050183f1beb9b501cd1be8aa90dda722788896480b
font_02_sfnt_off00013519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13519 17168 bytes
SHA-256: d68d7eb1307fa127d77f56803d85d059a4db61e5f9591ace5a8ec857d930e5fc