Malicious PDF — malware analysis report

Static analysis result for SHA-256 a525510b845c5fe7…

MALICIOUS

PDF

90.9 KB Created: 2021-08-11 13:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d97a2b89c342395a8f86061559bbbc6d SHA-1: 4b1fa03256f610b09eaf089994d846907527f129 SHA-256: a525510b845c5fe7efdcbc2fe10c1e899ecaec852f8bd2d7fec9f565f0d06d78
196 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and a machine learning classifier. The 'SE_CLICKFIX' heuristic indicates it employs social engineering tactics, instructing the user to press Win+R or paste a command into a terminal, which is a common method to bypass macro restrictions and execute arbitrary commands. The embedded URLs suggest it may be part of a link farm designed to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0808c3b552---golupofupiputugikaka.pdf In PDF document text
    • http://mlight.cz/archiv/file/75975638238.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/12396995364.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/32458056322.pdfIn PDF document text
    • http://shavers-boles.com/clients/7/73/73b1ad2e2c85410b7b015c0c79a6caf4/File/saxamemo.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/pasotopidosuxifen.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/fuduke.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160818080e23c4---poruje.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/16591567003.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/135e75840f7a3bf975c94d37a2936aee/gigogubitavefuwe.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/vuvufuvalisotoxa.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b232b986535---fobuworosuwobaluxoxevik.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/0dde49fd05ad388f4f4052c4183a2f38/70244472854.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/660277f93eb3bcc3336b0decaa854b1e/vazojinuzovezazuwigilu.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/19622049810.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6bbc20f38---fojoj.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/aggfe218308rouur4m50fu0pc7/niwateraka.pdfIn PDF document text
    • http://asfalon.com/__files/file/visefibatejozuvasananu.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/lekepexugijasaxadel.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/941f1c3f12ad53aa62fb7c9c4c0afdf9/funerupadukak.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f90f7e14a---vubekulonejenepemopudu.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1611021ce9ba55---lumazog.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/zunokuzit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=logitech+wireless+gamepad+f710+pairingPDF 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_off0000fb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB63 17428 bytes
SHA-256: 4dcd311f3ac15fa2e8f48d02da54ee151c178096ab530c620d61c10d6851e7f1
font_01_sfnt_off00012952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12952 11332 bytes
SHA-256: 3e7c8bc27a965b43cf399354e79fbd85eefd757d8b2b2166f974be4fafd5c34b
font_02_sfnt_off000143be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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