Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f8e611648f866b…

MALICIOUS

PDF

82.6 KB Created: 2021-09-15 17:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0b38fe1b0705372f616e3f41ec18e847 SHA-1: f6af09e6455bbed495aae4d748a5d447d746b148 SHA-256: 52f8e611648f866bc77bb7d7468f25a6d4593dd1ff17ea37e17c900170a25279
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and multiple external URIs, some of which point to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users. The document body is heavily obfuscated, but the presence of PDF_JS and PDF_URI heuristics indicates attempts to execute scripts and lead users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://shendaoguoji.com/data/attachment/file/32833222956.pdf In PDF document text
    • http://officeharbor.com/pdtInfo/16399868185.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/13954523106.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/purinemumumeba.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/jujejerel.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/kisoxo.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/lekakadadur.pdfIn PDF document text
    • http://atomleasing.ru/media/File/dowejukikasegaxarodug.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/70380920248.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/22771688871.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16140f5544191b---65808443374.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/wofolunarenojobupoxetejaz.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613726904adbc---72838538960.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/lixejupu.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/85679449992.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/rekurivifasa.pdfIn PDF document text
    • https://tuinvandecruys.be/file/fivokosalode.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/notojisibalanor.pdfIn PDF document text
    • https://domilot.com/uploader/files/20431660617.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/beponenipobos.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161413d188bd77---63435753190.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/tuwigetuzozejamomuj.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/wedotelumufuwexitewomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pixel+read+qr+codePDF 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_off0000e0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CB 17612 bytes
SHA-256: dc7faba98e71e36d08c05f1e842e73b18fe2a4f184997ef72862ddc5b7c4bb19
font_02_sfnt_off00012604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12604 10240 bytes
SHA-256: 33aa98f882c8b333fab2b8a01828d7f3f14b42f5045747eed20024486f0ecc41

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