Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d067a6bdd8d82a…

MALICIOUS

PDF

96.3 KB Created: 2021-09-01 06:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 530c44307cae91e0888a0b85695e0c97 SHA-1: 1f8c72262a95a613382d125d08e9f0482ec040ef SHA-256: d6d067a6bdd8d82a2697f9125ddc8caae48651251a05bbd27f9c02675e28b093
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories. These links likely serve as lures to phishing sites or further malware delivery points.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1612171b1e9a61---75674996268.pdf In PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a045e5c4e94---10853917167.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161004fe699e2d---pesezezorakorukukozuku.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080c2e58e770---lejoparenurif.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/d19614261ffa4c3e3175cce2933cbfe8/10398007486.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160e0423026031---20496093036.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16095f1b54db02---dufita.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-16/20210516150031749564.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/12252617226.pdfIn PDF document text
    • https://goodline.by/userfiles/file/3388161963.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/0a6f6d2bd8a3d088ba9eeebc27e8d41b/jefowuzorafo.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/54140160771.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/wopopu.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850b060cc72---10843184017.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/jumel.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a65dc8a162---12645014340.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/dematawivuxisunovofakez.pdfIn PDF document text
    • https://ebooksweb.net/files/file/fivilerobevitiz.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/41994703373.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/wejafawosiruwowe.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/89429574870.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/rerugizesuto.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/xufakefurinetaxede.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/53304747215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=fiddle+in+the+middlePDF 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_off0001159a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB0 9940 bytes
SHA-256: 1884c10115fb00124fe67a4baf321c623b981750371e8cedbc067cba962c4261
font_02_sfnt_off00014345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14345 18412 bytes
SHA-256: e4710941b7f2780a882cddf767b8c94e72710381899ad4dca259eb4d09079a87

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