Malicious PDF — malware analysis report

Static analysis result for SHA-256 25becf88c19b6863…

MALICIOUS

PDF

94.4 KB Created: 2021-06-28 18:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f248bf660c41b694f8aac4388042e58 SHA-1: 15fd0db0da848e304242b5dfcb1bb77e02191bcc SHA-256: 25becf88c19b68633e300b6b18cba3f8fd988d2e4f1eef742174ffbbff67d36d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of numerous links to compromised websites, including those identified as link farms on disposable hosting, strongly suggests a phishing or malicious redirection campaign. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 7

  • 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.
  • 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 http://sportschoolindex.nl/images/uploads/71168986998.pdf
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/15230806008.pdf
    • http://e-photo.lv/ckfinder/userfiles/files/taxafejoni.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/613124e95b5ca81b1855d2a224c5a6ab/3946874165.pdf
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/bad34ac7569979b38c89677cc390bdd2/98514321677.pdf
    • https://travelstore.tn/userfiles/file/fonanalajojatakokoji.pdf
    • http://2478.ru/admin/ckfinder/userfiles/files/97117507058.pdf
    • http://hiace-yoshikawa.com/js/upload/files/pilurofumolufagavuxodotor.pdf
    • http://burelomdo.com/ckfinder/userfiles/files/vodikavema.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb303495d1---wewonegubap.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16088912b55f7c---90415756065.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084856ee2555---36292270955.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd95863aa0---zabufol.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c2945b472---57142619363.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b4af3e08a---65368481764.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/adfee3f5fd49d344ae5c56641cdae27f/lakitifurazafigil.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aac463432e---71203818980.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/416fc331c4043a8ee6f6abafb6dff57a/legezizobelidoberum.pdf
    • http://paliukenas.lt/i/File/fazubupoworawega.pdf
    • http://shannonlakeestates.org/fck_images/file/sezebetijaxiguzobapenosig.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/5542f41f348c108223c1529520c5f1f8/wesuvirirubigugirapedomif.pdf
    • https://mytopics.it/uploads/file/92291767956.pdf
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79276922856.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=learning+cantonese+after+mandarin
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001044a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1044A 16792 bytes
font_01_sfnt_off00011c61.bin
ba4f35c6b814055fa7deac9bc9f0bf7fdd5446e47aab4cddc9201f5139353b39
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C61 10732 bytes
font_02_sfnt_off000134cf.bin
aa9c09955e4e1df39b05c5575d57d0f66cc21319af591a1c43fe75b1e858dad9
pdf-font-stream PDF embedded font (sfnt) at offset 0x134CF 17392 bytes
font_03_sfnt_off0001623c.bin
3b2665576e0e733557d54fd8b7ab9fbf951407a02dcda8f4f3f3dabcf3176750
pdf-font-stream PDF embedded font (sfnt) at offset 0x1623C 1708 bytes