Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfccca60f0aab95c…

MALICIOUS

PDF

77.3 KB Created: 2021-07-19 01:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9818cd35723bce85d543fe59561e491b SHA-1: 023f126d19e8e960defb1fdbb38cb65626f3d9a5 SHA-256: dfccca60f0aab95c62150b23fb128980487748c35ea7e72041619ece5344a3fd
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to compromised WordPress sites, likely serving as download portals for further malicious content. The PDF structure and the presence of multiple external URIs suggest an attempt to lure users into downloading or accessing malicious files, aligning with a phishing or exploit delivery strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757c87648d4---guzifajexugoxomamiziwetaj.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f13574ba266---7339315633.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e94e91101e---moxelazo.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085c804341b7---19373394889.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a723cb92f1e---rajijozela.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/36092158273.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f7bccfb46e93ea8bd5da7227247731c2/28731434135.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/63119224107.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1ecc4ad0---zetifanavuwadetupa.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/waxagorovikibudolexav.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/xewiz.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/49013891298.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/8a58312793b354b3af0bdb20141b1ffd/64126721563.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/1f84eb36e30cf77a592273f2dfb8bccc/43933055945.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/91152341523.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/20447987977.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/61360280136.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/dc131ca6fa490dfe12e2be24cb878237/wonoxolikepopamugaxerol.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/mf2aa4tn44kbb3nrfgvhmbo483/42669280056.pdfIn PDF document text
    • https://castel.ro/userfiles/file/rotovatume.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/66641572825.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/b4lsg0394f05evq11n04vl85pr/tigexiropu.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/13gek4qj6lgtgms4etbsjgc5pp/kodez.pdfIn PDF document text
    • https://argumentua.com/i/file/8589812540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=free+chips+for+bingo+bashPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE816 15728 bytes
SHA-256: d06bb9c002afcef124162c2e25cd5f2f5fc53b8ace5294f26c137f7c8a2cee9b
font_02_sfnt_off000110ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CE 10732 bytes
SHA-256: d1ee6eac8f225968bef1f84c5be13de6db5724ece47a4d021684fff93c1d55a9

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