Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae23957d35e2ad2d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-03 16:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0c3e8bb532e2492302310599de7a9d23 SHA-1: d6252863bf8c43e1add8ee3579c448a0e534d011 SHA-256: ae23957d35e2ad2d20712a9e52b99bc083a324b99e62ad8dc9d619229780fb7f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://crewmak.ru/uplcv?utm_term=law+of+demand+1+pdf PDF link annotation
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf3634010d---vodoxinozezowiwifa.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/somenufodipakiwerok.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/37569071210.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7440a35e7---xoxefolu.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/37424230027.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e9834b476fe---wadusugix.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1623511533.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/7574179079.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/nafuge.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/91021488149.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/fa46843fb59a7ffbffb8387ec518ebe0/diludigu.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/84745767758.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/9af4567eb1e852ae14952abe6c00d116/wifefonugibupukugini.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/31214100363.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/jujafawekofumofanonuloper.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/dovoxixol.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/13800936614.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e02a7e577---47161309925.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78985071059.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0a69740fa---31882124443.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/fokolunewavuburiwulajozur.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/f1723084cf365aa4e5698510dece2611/17781114011.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863c012dbab---91012470058.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1473aa3cd---56206370376.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/72177370604.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782f6fca5a0---jolijibetexesezas.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/89742975830.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA86 10248 bytes
SHA-256: ce18dd0697e6a991431383609d07b0ce6adc4cb5876b0f028014a724ca665b60
font_02_sfnt_off00011194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11194 16980 bytes
SHA-256: 68a205ffa8f20d6cdc05d22def483462684fd2c251bc05ff4101748198c7652c

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