Malicious PDF — malware analysis report

Static analysis result for SHA-256 df07fe57da88eaf1…

MALICIOUS

PDF

183.4 KB Created: 2021-06-09 03:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 029a805776a3a9c4d2678fd31757c62d SHA-1: 7695191ea2d0bd101da0deee5f101022bf72bb44 SHA-256: df07fe57da88eaf1704837d78448289811f56380ad7e28d9fa07fc23d1951101
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or other disposable hosting domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload. The document body is heavily obfuscated and appears to contain metadata rather than user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://wastran.ru/uplcv?utm_term=phonics+list+pdf PDF link annotation
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/57182fd7851440d45d6a32e86501d83c/bafurolarupalolufixo.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/58327473429.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2977244004---wipufezafemimatolu.pdfIn PDF document text
    • https://agatanorek.com/files/file/vukekagijeka.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/javugawatasejixaped.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0317a54b6---gobubevoj.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7528795777---4415455306.pdfIn PDF document text
    • https://airshow-bg.com/file/98364235894.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16078d90b8896e---93259542461.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/cda61a65642339e8827af8545781ff62/78020468792.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/96419868151.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/moxad.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/57694710328.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/pigazeta.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/pj3mpmli96rd8h2vnboiese4u5/gadixezoxudugejuwugolud.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609435df97e45---77902746719.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn 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_off000278ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x278AC 4936 bytes
SHA-256: 88321b88a61dd3cbb4acfd6eb624b45003e9bc87bea13ef530be125142709288
font_01_sfnt_off0002897d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2897D 15232 bytes
SHA-256: eba4962e612b6419b45dfaf1377e056dc0222edffab7ac30b61f78406ede94ed
font_02_sfnt_off0002baf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BAF5 16180 bytes
SHA-256: bd1633bffbc95aa362f2ea6352e2ca2bf450cd9de49862b8a2fe701fb83f5e65