Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f4d950d90c4d2a…

MALICIOUS

PDF

91.5 KB Created: 2021-06-27 01:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2127b909054fb7cf9b1f65501a05b07b SHA-1: c7a02f69f4c355ef60fc4fd2f2dbbe17efb8d66f SHA-256: a3f4d950d90c4d2a2ee96bc36fd63ec59603b81291f6dc871ce240123a178592
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting it functions as a link farm or redirection service. The 'SE_CALLBACK_LURE' heuristic further suggests a phishing or scam pretext, aiming to trick users into interacting with malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/e744e72220db4db32fa4a6d901953b74/35078738064.pdf In PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/94b5177a3560b00747239654fc13e8c0/bepufakowubopag.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1a18c06f5---wowonesulupubemulesoba.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/gogufibibekanevawup.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/uigcv2mtrgr4jp7sas29u7gsil/gotokasetolixakisuvo.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/174dc4b69263be2fa4d896f9dfc903fc/33639794664.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608141050b4c7---tunajarig.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f9c4adc80---xerobaxexazafukawusup.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/96d1b439cc736c70061b6574e2c9780c/vegoxe.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/l3mr8posul0on3s3dnifhtpm1h/nafikumizigisatupof.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/b6b563dfce153c96b1fa2d879a21ee2c/72469072614.pdfIn PDF document text
    • https://hostessima.pl/userfiles/file/lorerojarotujijijak.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d356f1a4280---sanowepa.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/sapivabofijefafomigar.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e810418fd---26016214663.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160719d995cfba---30808385700.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/gitetogasi.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/70470011754.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-7/20210507104522552041.pdfIn PDF document text
    • http://cnp-inc.com/ckupload/files/83168551302.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085d7b63bae5---derovofosetex.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d9d7ede65---tonuvazunaza.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a796b4f830c6fb4769d580f372ee5cce/20099657922.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073e74b0493a---xovuseresixodenugo.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/sevibejedupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=scriptures+about+fellowshipping+togetherPDF 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_off0001007f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11891 17452 bytes
SHA-256: 83a7bd73237adc3a73ceb5510f1e7e637054350f674904d4e548efbbcbe50a12
font_02_sfnt_off0001465d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1465D 11160 bytes
SHA-256: 9e160a4b4c1acfc5dd5a1ca6e3765ae43c4c5f3d5d2b259d81e432909c1471bb

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