Malicious PDF — malware analysis report

Static analysis result for SHA-256 abec59be18f6cabc…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 09:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d96c6e99f2ee95bbafcac645052917cc SHA-1: 1aefe0cd208502be609a4dab22d2011bde917e6f SHA-256: abec59be18f6cabc6e724f027c5dfb4390a9495b9bef35d186ea91553133a640
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://inwebjor.ru/uplcv?utm_term=fmovies+download+apk
    • http://zhouzhuanx.com/v15/Upload/file/20219102013131933.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/7ff1e14d4f19e50eb3156887ba4d1b51/xuwogarukesutifotu.pdf
    • http://md-servicios.com/userfiles/file/24531495724.pdf
    • http://vhz.cz/user-files/86819236538.pdf
    • https://kitapkaplama.com/upload/ckfinder/files/zuvegefijuzol.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613888934f2fe---60660007616.pdf
    • https://jurad.eu/files/file/bovup.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/cbf463fcfa868d07d19778b7316992e4/pafelujejuxusomereposu.pdf
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/midabelaz.pdf
    • http://olynskiconstruction.com/pics/file/bewepufe.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/d3281610ea0baeb3bd928cb497f42887/vovafigativuxoxedaferuses.pdf
    • https://cinemaparadiso.site/uploads/files/60873509361.pdf
    • https://dpt-mh.com/uploads/news/files/97802325544.pdf
    • http://naturalmis.com/userfiles/file/duwozafikafebotalof.pdf
    • http://byecook.com/ckupload/files/4366429938.pdf
    • http://axi-hohenstein.de/userfiles/file/dazemupox.pdf
    • https://we-plus.tw/ckfinder/userfiles/files/42812598179.pdf
    • https://uangraja.com/contents/files/xomulukoto.pdf
    • http://prestinoequitacion.com/imagenes/upload/files/bawomij.pdf
    • http://benevolo.it/userfiles/files/nimomeren.pdf
    • http://wxbeimei.cn/upload/ckimg/files/202109060724396190.pdf
    • https://bankubezpieczen.pl/userfiles/file/21632638897.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/093b0bddf51f813f61f2e884f2bfd458/59963918247.pdf
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/7540912518.pdf
    • https://spvi.cn/filespath/files/20210910112357.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a9fef0f8f---29113733572.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_off0000e080.bin
50a6043e73f465225fb4f08f17d8d9eadbef4417f487efdef69b7c71be9b8898
pdf-font-stream PDF embedded font (sfnt) at offset 0xE080 10576 bytes
font_01_sfnt_off0000f8a2.bin
d793038ec087e3d133dd5b3d1dbaf7191ad817ef2ea9be74d9dd98a798f5ceb5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A2 18336 bytes
font_02_sfnt_off0001286d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1286D 16792 bytes