Malicious PDF — malware analysis report

Static analysis result for SHA-256 16deed34237a31ae…

MALICIOUS

PDF

86.3 KB Created: 2021-06-30 00:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d666abe5c8be946a4fd439ba821704ba SHA-1: 533a7cffa07c5d0242a84b0bcdbaca72e744cdec SHA-256: 16deed34237a31aea4e3fe61b936581dc4b7b0ccd5cb5d9e9cc6901756e94a12
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link distribution scheme.

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://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/90aouplkqpf4983m667p4k6rsr/46597302790.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/d0bbdc9ce792bd3c8308382df7a1f4ba/tuzuferivelazawujopidu.pdf
    • http://lakes77.com/clients/47041/File/tawaxaguvaxovapodepijim.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c7235c1ad---wisefuwen.pdf
    • http://polymer-optix.de/userfiles/file/majagepenulo.pdf
    • http://web68s.com/upload/files/96430173624.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/f7jgt12qgm8e653r444nqm04jr/botawiwexiwiledofugikigi.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad017c27db6---8974849471.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c38d649062b---fajevurukibosumafibigipiz.pdf
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/0b8adf585543b0d8a3152d2c70c84475/75033805149.pdf
    • http://stalmost.pl/userfiles/file/wokubamadazupepagesi.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/7mv353c621off8ntiimnloh831/vimanonuninunurazubobanop.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0f232c31e---govigivojadosuwope.pdf
    • http://kangs78.com/clients/66216/File/kabamojaxosebiti.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608147421d0b5---36676485308.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7b2004a3c---jenazusewinuladipukiletis.pdf
    • http://hoadondientu-ptp.vn/images/ckeditor/files/9336063847.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607199d6a2a05---zesunapizawexe.pdf
    • http://yepuco.com/uploads/files/55143862519.pdf
    • https://juhaszautovill.hu/userfiles/file/jipakonuze.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/3b2c462407a7484ad3655873c145a56c/sowasufupogizalubud.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607947d0ee265---74477733937.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=liquidity+risk+meaning
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/40b35670f91f076349b35a418a47728d/vojezowako.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_off0000ed30.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED30 16792 bytes
font_01_sfnt_off00010542.bin
8feb345b3e1ca2e27a3dd768855d3dce7aa64740ba369c9ad2e676ec3b61611f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10542 17928 bytes
font_02_sfnt_off000133ca.bin
07da928128fe5155baa7cf3745c668a15972ace6fa614d3630d5fd0c49c36e12
pdf-font-stream PDF embedded font (sfnt) at offset 0x133CA 10832 bytes