Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c5cca4496e5043…

MALICIOUS

PDF

79.4 KB Created: 2021-09-13 09:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 08386ff139d7eba06d7fd80ec79a6d87 SHA-1: 05a702ba4adc9148e43130840bd66f482d779eca SHA-256: a2c5cca4496e5043c9724bda75d9b86a768e878365bae6b548c3378e576a081a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 https://queure.ru/uplcv?utm_term=how+to+use+phone+as+webcam+for+discord PDF link annotation
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/a8b4120786544f69b5e0a65670158ca4/73662742440.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sajikovudatuvowuza.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/saliv.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/35273021671.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/fupamekojiwimatomogaluliw.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/zegozojutulerafasivamew.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136a29f49181---jujaturumibat.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/72735513300.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/71611548618.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cef5aa576---74672892150.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/wezeximipuse.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/gidakowagafilivejixexatum.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210903_130001.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/73772401794.pdfIn PDF document text
    • http://apcmagon.com/userfiles/74928665315.pdfIn PDF document text
    • https://2acontractor.it/images/file/limilekipenigijopirakowog.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/75128413748.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/78073240113.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/geworejalo.pdfIn macro / runtime command snippet
    • http://deleersnijder-bocaege.be/images/file/nirewaxirobukegexeranip.pdfIn macro / runtime command snippet
    • http://daltan.hu/userfiles/file/jijaxunibetimisur.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bd8e4d6bd---5270966960.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/77968419570.pdfIn PDF document text
    • https://unicon-msk.ru/dIn macro / runtime command snippet
    • 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_off0000d124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD124 11156 bytes
SHA-256: fce474cc8d4a77d4d4231508fbeccd1c3b325be2b60c4f78b6ec89b789b2e971
font_01_sfnt_off0000eacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACF 17120 bytes
SHA-256: 9843b7636a6045fe9f8f89bd97833a33b359ef04d3caf382d6c5a6c27f65d78c
font_02_sfnt_off00011735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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