Malicious PDF — malware analysis report

Static analysis result for SHA-256 0023ef0b28c75d4f…

MALICIOUS

PDF

78.7 KB Created: 2021-09-19 03:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 522650b9ae05db96aa784321c458d1ee SHA-1: e2f7693ca2e0e714e33a30acd551a99913112821 SHA-256: 0023ef0b28c75d4f821814094b65cf1be2def730f3b652d44aa0705b6ae3e833
196 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links to external websites, many of which appear to be part of a link farm. The 'SE_REMOTE_SUPPORT_LURE' heuristic indicates the document likely instructs the user to install or connect with a remote-support tool. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to trick the user into downloading and executing further malicious content or granting remote access, aligning with phishing and exploitation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://osakadentalcare.com/contents/files/79123259297.pdf In PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/zuwosas.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/96474261422.pdfIn PDF document text
    • http://ping-property.com/user_img/files/30250423125.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/30848610775.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/45399568014.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/84490572194.pdfIn PDF document text
    • https://aksusu.com/upload/files/30468471795.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210915230955.pdfIn PDF document text
    • https://kede.org/userfiles/file/rerowazotajezujudirote.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/besazejavudesakumazoke.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/94385328463.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/06a9cc3df9c42494d3cd46e05a5bb716/8148914467.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/4f28b7676ff869544863dbeb90d2b7a7/zurotamodoxore.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/rufumuxumapibosuzurepa.pdfIn PDF document text
    • http://mfahk.com/upload/files/beraluteponogawozakasi.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/nugametolune.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/59860030936.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/29704246526.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130dbb03dbc2---21718283662.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/14c69c0b50adc4e34b4d095f33646005/xusekiwelatopenopupabino.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/sejadomitifawudewor.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/6170708372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=purple+pacman+ghostPDF link annotation
    • 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_off0000cf60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF60 17688 bytes
SHA-256: ad3ba5a3faddeb26e5c3a5aa1f5a1d0365f311d170b43a513865cdbaf8a13e21
font_01_sfnt_off0000fd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD17 10828 bytes
SHA-256: 1a4dc4ef6b316b0ffa04e3f30fc2dfe4892f9d78309263526e387be5a3504484
font_02_sfnt_off000115f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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