Malicious PDF — malware analysis report

Static analysis result for SHA-256 626d3da7b602876a…

MALICIOUS

PDF

114.5 KB Created: 2021-06-30 00:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 51e6fe4f9daf93ab887c49d71eae6215 SHA-1: 22148d7a02834ff7ae80258db8e829a3751ba0ca SHA-256: 626d3da7b602876a4e5ad58c29eb1f8a5c644d72da9bf76f95c5537624292d8a
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://wallawallahighschool1968.org/clients/75819/File/65884948742.pdf
    • http://short-story.ru/upload/file/24784085884.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8a006f54f---20253706809.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/a8a2187202089527d652d0ab1b46f05f/wexiziranukotu.pdf
    • https://bcbc3399.com/upload/files/gufuk.pdf
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/68773023680.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/qaer11ve179imu9sb9k9funcer/7612842784.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/016310f73fb59dab6d15b62a5ef6021c/66506841352.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/cd02abc8b7a1cf8e4ee4dd95a7da8b19/fifakamarewugikikob.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d252c735d4e---sitagisina.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/44156252172.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/luda50v9ic03c2qgdlqf83j7n1/wavodotelodudode.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/jkng8ukn4hrhhsalgf70tecdkf/96778872513.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a1166b3dbb2---rugug.pdf
    • http://creptiles.dk/userfiles/file/vukedezerafonegunutakek.pdf
    • http://www.herbertvanderbrugghen.nl/draft/89956638177.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c16516f1860---42377988809.pdf
    • https://ludifrance.fr/userfiles/file/43326443943.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/b7c4d8e0a1f4228b96e6fb724aa003e3/xelemori.pdf
    • http://mygotour.com/FileData/ckfinder/files/20210605_BCE0DCCD1F391271.pdf
    • http://rainbowcaterers.in/userfiles/file/sufewixokubu.pdf
    • http://sugarfree-gelato.com/upload/file/10254610522.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+cherry+orchard+play+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_off000153b6.bin
67fbbb68b9b55777443bf8ad7d3e9d35d981b99b221e160a6caa59b301eb6adb
pdf-font-stream PDF embedded font (sfnt) at offset 0x153B6 10332 bytes
font_01_sfnt_off00016b2a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16B2A 16792 bytes
font_02_sfnt_off0001833c.bin
18fff2036fb1cb57f7faa2e23305dffd7168e04206115a8ede889ee0af8d838e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1833C 25092 bytes