Malicious PDF — malware analysis report

Static analysis result for SHA-256 d45e20e6928277ef…

MALICIOUS

PDF

87.3 KB Created: 2021-07-31 07:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 72875159c700d4fcc33591868133a7d3 SHA-1: 142885adc7991bbf1439d8f4fbcc5aec5c48dd51 SHA-256: d45e20e6928277effb54d6bc8dc38c5423ca85f245275852ee47861af3fc8fd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users through these links, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://medvor.ru/uplcv?utm_term=cobra+cb+radio+says+antenna+warning PDF link annotation
    • http://nct-vn.com/userfiles/file/8500788658.pdfIn PDF document text
    • http://kleiberit.ru/files/file/xisikox.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e9470d2bb71---80300354506.pdfIn PDF document text
    • http://grandbarnettfamily.com/clients/a/a0/a01b80d98e57c38af56892ab55e7d82f/File/lexef.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/tinomusimitijebusazap.pdfIn PDF document text
    • http://redactron.com/userfiles/file/24068376128.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-22/20210622191603635952.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16084a4bc47bc2---sivupunopupabomipekosula.pdfIn PDF document text
    • https://coluer.ir/documents/file/8582505340.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/gutunugu.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/lilezivaka.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/880d6030e8d45fcbdd7552a41dd74007/91532164021.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c97c3a3d1a2---54094990367.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/22633bb37ee092bdf3571d6dc80f7111/megeka.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609dee670091c---70333577392.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d217c84e7---meborafavuruz.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/xuzilikagotutekeze.pdfIn PDF document text
    • http://gtshotel.it/images/file/salukapifumixodinijuwonom.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/93388c59070f57c2a8655b6df60c77b3/wuzanowa.pdfIn PDF document text
    • http://macphersonproperties.com/clients/876251/File/mexov.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609da62250add---fekawogevobuponofememix.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/28771806900.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/23008332252.pdfIn PDF document text
    • 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_off0000f1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BE 16604 bytes
SHA-256: 7bc82e957d4e559eca3632f469a158dbba5a81577a4fe4a00ac825fd488c4165
font_01_sfnt_off00011cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD9 10868 bytes
SHA-256: 1a047391964e48459d9c763cdc43142ef08f07a0cdb150a9cfee03d2bae48477
font_02_sfnt_off00013604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13604 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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