Malicious PDF — malware analysis report

Static analysis result for SHA-256 2781aa51cb82b087…

MALICIOUS

PDF

85.6 KB Created: 2021-07-14 05:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6232e3b5ea1b67ccfbc4501fc125c590 SHA-1: 7b8be6891cbbd79bbfb5c2bec541481a1decfba4 SHA-256: 2781aa51cb82b087d736a68ee8218ea24ec27f1b244b054910742b325a630f52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution lure. No scripts were extracted, but the PDF structure itself is used to host numerous URLs, likely directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pistant.ru/uplcv?utm_term=graphic+design+timelines
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe8c7e4b33---wagiro.pdf
    • http://yaeram.com/userData/board/file/pebep.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c140a05091a---78787973092.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609054201b04f---fipozid.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/6jjqng01ui2ku9e9qf4fc0if00/19580185295.pdf
    • http://hnatiukreunion.com/clients/b/b5/b5561851e3069b632e798ef7a1275556/File/11761832050.pdf
    • https://chinese-wall.tw/upload/files/6956747621.pdf
    • http://pattersonandoliphantfamily.com/clients/875492/File/tebanesabara.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802d8524e8e---35746268541.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/9c92ea04424559a90234c757bd85ed43/81412271260.pdf
    • http://kubabus.cz/novy-web/upload/file/15072008357.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/7frblaeo1ii8323gd86amqsr3h/21688188491.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fbf2a612---17300738361.pdf
    • http://boilerservis.ru/uploads/files/58064130856.pdf
    • http://xn--tnqz8hz5cb8l.com/upload/files/fijove.pdf
    • https://gtselect.fr/ckfinder/userfiles/files/80559842878.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160844c625648f---mafitizikamagidexik.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608021a751124---kutozanu.pdf
    • http://bannermaul.com/userData/board/file/kisugijutinobekazolufe.pdf
    • http://xboxheerlen.nl/userfiles/file/zofaripazak.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/9539852b53a0edbd8db2c121b1b1e230/welipotegeselax.pdf
    • http://musikpark-live.de/userfiles/file/65538794129.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160b1084ab9726---ronobewegog.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/q6ct9hj17blamt8u4qrc3j8c3q/semadadupipudexelirug.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_off0000ea3c.bin
d0da5c6fbf0d7845f123f63d3c8cd94781c4ed1a8c719f182204f3b63f1583c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3C 10880 bytes
font_01_sfnt_off000102fb.bin
20c99ed71190760c3232ff4a1468a706093745f16ae2e5f2d0b672867dce8065
pdf-font-stream PDF embedded font (sfnt) at offset 0x102FB 17664 bytes
font_02_sfnt_off0001316b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1316B 16792 bytes