Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9461b9b4f992a55…

MALICIOUS

PDF

91.2 KB Created: 2021-07-05 00:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a277988f206c1ffe982a5b6b79e1adcd SHA-1: 1c6adabbca9901bc6295f60ed5a94d2403110ccb SHA-256: e9461b9b4f992a55241cfd67e74239f064eb4a0e96e0af8725d63f4be5fcf4d6
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The ML classifier also strongly suggests malicious intent. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://ancoraeducacion.com/images/runem.pdf
    • http://kojeneckezbozi.eu/userfiles/file/3104112275.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a634cb4b41d---fuvudekuxapuvivero.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16087e7e1d3df2---bowibumimepamifuluminot.pdf
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/hrt4fdd5gbrf9t91p76bs7up7i/divilidikoxizuvubefur.pdf
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14350802642.pdf
    • http://dietaltop.com/userfiles/files/xotowugit.pdf
    • http://skolicka.eu/foto/images/file/punukesenixuvogudujed.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8807a268927e213449eced212fa1001/25108951955.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/tp15ugkm0o86qgdkrr546ugll0/woxopowurorarigo.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609120c437da8---40807750789.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b390f0635b8---vapewekuxekedurodedoba.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4f861cd0---fawapixixamibareb.pdf
    • https://wfca-czech.cz/temp/userfiles/files/63921753511.pdf
    • http://ateliergermain.net/sites/default/files/file/98616000017.pdf
    • http://bjsprt.com/uploadfile/file///2021052519422249.pdf
    • http://cy2hand.com/userfiles/56841461488.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cbc7e7a99---gexosarorilasemipi.pdf
    • http://agendatourvietnam.com/hinhanh/file/93948441670.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/l81p3m0j0nnce4l2c2s19n1psu/xogifusalaferolajadurop.pdf
    • http://jucal.es/images/file/9616360298.pdf
    • https://designclarf.it/file/73666221774.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ba5e853cf---pidimesowowepesidamu.pdf
    • https://espaciocultivarte.com/ckfinder/userfiles/files/99240909967.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=dog+groomers+nearby
    • 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_off00010102.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10102 16792 bytes
font_01_sfnt_off00011914.bin
c787410abb52f825408c42b748946581669179042e0d7336d0e484e85e01a84e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11914 17396 bytes
font_02_sfnt_off0001467a.bin
c712c03816b57424c74248bc46ce404fdbfd5cca757485020632a975db95a245
pdf-font-stream PDF embedded font (sfnt) at offset 0x1467A 10468 bytes