Malicious PDF — malware analysis report

Static analysis result for SHA-256 63beb8f3c12aaf61…

MALICIOUS

PDF

94.8 KB Created: 2021-09-06 05:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da118386edb618de900941c550b67ba2 SHA-1: d34c6e646418ee56b61cb6de88deb1ddb48539ae SHA-256: 63beb8f3c12aaf61901aca5e8901f4ba2ae17240f8c3776bb9608dac25f89b83
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, some of which are identified as compromised CMS uploads, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 7

  • 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.
  • 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 https://luminex.pl/upload/file/63461045619.pdf
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/93910713430.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c935437c41---17265285758.pdf
    • https://hamzsabegi60szallo.hu/UserFiles/File/46497122570.pdf
    • http://aaaexpressheating.com/userfiles/file/31790330240.pdf
    • http://yongqingtech.com/d/files/vobujon.pdf
    • http://absolutelyneon.com/userfiles/file/zafarowo.pdf
    • http://poliinc.com/upload/files/lovilatixelesafaxu.pdf
    • http://artgrafika.cz/userfiles/file/tileju.pdf
    • http://zartmobilia.com/userfiles/file/20210523074315.pdf
    • http://andreaslasnik.com/data/files/91738009722.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/0570609e52b093f2a131cda3b3ca91eb/10712994701.pdf
    • http://biosite.ru/images/news/file/32822473662.pdf
    • https://porterbrothersltd.com/app/webroot/uploads/gawobinedof.pdf
    • http://tnslib.net/userfiles/files/xuretadupemomavidatodo.pdf
    • http://autoscuolepintozzi.it/userfiles/files/99570533667.pdf
    • https://sluganarodu.org/userfiles/files/39898430013.pdf
    • https://bruceautoservice.com/files/file/jikizazigedobojozive.pdf
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/20429207006.pdf
    • http://casinodanmarkjackpot.dk/userfiles/file/danovisekalomi.pdf
    • http://kfbi.ru/content/file/goseraxo.pdf
    • https://bokaichenyu.com/upload/files/81816515514.pdf
    • http://www.haztartasigepszakuzlet.hu/pics/file/85955885275.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/46b5934e1192236547039783e04a96ae/21029271612.pdf
    • http://burchiellati.com/file_fck/file/xavosir.pdf
    • http://chretkinia.pl/userfiles/file/ludiwakegu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=grandezas+f%C3%ADsicas+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_off0001057c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1057C 16792 bytes
font_01_sfnt_off00011d8e.bin
0a0e56ca364ade21bca3f744576dae19951fbd59985ff07be8b38ace2c2b7f9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8E 21464 bytes
font_02_sfnt_off000153a9.bin
68a6f91d2ac579c96117102b46190c9471f7af3928be33416b6f453946679b0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x153A9 10508 bytes