Malicious PDF — malware analysis report

Static analysis result for SHA-256 399dcbddc352bc43…

MALICIOUS

PDF

85.3 KB Created: 2021-09-02 03:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc0087b1424d4014f193fd8d62c31097 SHA-1: 674fdb4c1a4f6abef9983aaf088b1d90b9fdd4da SHA-256: 399dcbddc352bc4395084912ff6901f05c055b5a4ad1719001855020b6b4e691
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. These links appear to form a link farm, a common technique for SEO manipulation or distributing malicious content. The presence of embedded JavaScript suggests potential for further exploitation or redirection. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://philabc.ru/uplcv?utm_term=promo+codes+for+pokemon+sword+and+shield
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d66cd10f0---winevinulosiruzavawig.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b9ddc00a9---tejaret.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ad7d90d0e---safipat.pdf
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/56261254867.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608442b691ef3---91798552420.pdf
    • https://dejavuruse.com/userfiles/file/13377865555.pdf
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/dalokaxokobuxij.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/0rufjk8pnhee1gqn8cmcs2702q/diwifumonufuputimukutul.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b74224f16b---74983702926.pdf
    • http://2sisaccount.com/userfiles/files/nozopajibinanalo.pdf
    • https://riolospettacoli.it/filesUploads/file/90479489178.pdf
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/50272058748.pdf
    • https://lawina-radom.pl/files/file/zamivimusajalo.pdf
    • http://regalmotors-jp.com/js/upload/files/8683433208.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b38ec747e7d---jivoxobabuberuluvudugavu.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8b694b6ce---43602867266.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071ddfaeeb2c---40864738097.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1611ee75806feb---77651444068.pdf
    • http://fouladsazanco.com/Upload/file/nemikalove.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/guop3r565jhkih51vtbqkab517/kebitu.pdf
    • http://vandientuchinhhang.com/upload/files/madobetaribewabekin.pdf
    • http://indovinandoilmondo.it/themes/userfiles//files/gimipapuwid.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5c2481b78---barudomitazazedijan.pdf
    • http://turnwealthy.com/ckfinder/userfiles/files/78680988476.pdf
    • http://pastadimatteo.com/ckfinder/userfiles/files/30929464370.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_off0000e144.bin
136af11591fad0b28a9898e2b9efc39b5549b67604fc6519ed0dc87684c1c838
pdf-font-stream PDF embedded font (sfnt) at offset 0xE144 10964 bytes
font_01_sfnt_off0000fa8f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 16792 bytes
font_02_sfnt_off000112a1.bin
c7fc0e0bea8c744af95b93efa448102dd8c63a837935676034e5690a95603744
pdf-font-stream PDF embedded font (sfnt) at offset 0x112A1 20140 bytes