Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a679b5557de315…

MALICIOUS

PDF

123.8 KB Created: 2021-07-09 11:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 436f1d7307ffe9ccaf7c4de900a120cb SHA-1: cb79cdf80937cc23d63289044baac69c8b98df34 SHA-256: e4a679b5557de3154948069fad6c49b555d0abff804a7af9857d177d5503c75f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites and other domains, likely intended to lure users to malicious content. The presence of external URIs and link farms suggests an attempt to redirect users, potentially for phishing or malware download.

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://pixomot.ru/uplcv?utm_term=sex+and+violence+muppets
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/b516c88ee588848e933fd27c3d4f76c0/45011490272.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16096afd752706---deveximujonukepagozigup.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5cc636a7d5---mekasurijasep.pdf
    • http://cokhitienvuong.com/uploads/files/jumufasuwageme.pdf
    • http://slsnn.ru/content/files/wepamemepaba.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16073cbda7c1b2---jivexidapewugononog.pdf
    • http://mulroyenvironmental.ie/userfiles/file/tojamusafa.pdf
    • http://ural-resyrs.ru/data/file/83294057995.pdf
    • http://sungsam.net/userData/board/file/jolifabezoridipix.pdf
    • https://kudamatsu.org/userfiles/file/31223406747.pdf
    • http://ahkjt.com/upfile/file/mizabej.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/331e2aa0fc2f0a0ebaaee884878e82f3/fofetovogasapasire.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609654b3b4af8---28588675068.pdf
    • http://renovfab-menuiserie.com/userfiles/file/zilagobobew.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c136600158d---56190098038.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/1e553f55eb8b65846fe1d2be9390fe5e/mivokol.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/b4ce535e31e06896bbf68b486bbb812b/68805930319.pdf
    • http://aisef.org/uploads/userfiles/file/file/38897369329.pdf
    • http://ackerviewguesthouse.com/userfiles/file/48717098544.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096af67f1b72---riluruzupofuwipos.pdf
    • http://studiocalcinoni.com/userfiles/files/zutafigazufomurowuwuwow.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/528a7c90d884f1c582a3b9ee886f4ecf/34883453799.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_off00017e7b.bin
af257fd146aeef4046aa74bd3d438a81dfccaa994a4e5740bd472bbe3c42f29c
pdf-font-stream PDF embedded font (sfnt) at offset 0x17E7B 20072 bytes
font_01_sfnt_off0001b104.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B104 16792 bytes
font_02_sfnt_off0001c91b.bin
59c9bd94b00b7f94befdd5cc08f9beb0090b9db3ae9b6d7cb34ee86250b47ff7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C91B 10920 bytes