Malicious PDF — malware analysis report

Static analysis result for SHA-256 710431e80028a9cc…

MALICIOUS

PDF

90.5 KB Created: 2021-09-01 18:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bbb3a8368948723654c4ff101b5aec4c SHA-1: f20921c4fdae3d248192146c1ef537c7e537b20d SHA-256: 710431e80028a9cc9d2cab98d651df7a81b3fde585b5c680f8210d95aab1f52b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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 http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16108040eec842---fagoxamuwemozinutekamox.pdf In PDF document text
    • http://aaaexpressheating.com/userfiles/file/tesosaxotujigajow.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/29350233604.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7c02f1521---12811802321.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3449f8ec12---35848288926.pdfIn PDF document text
    • https://apronorte.org.br/ckfinder/userfiles/files/dutejikabopemagoxakapula.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f89251ac8b4---datujovar.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ef425a320---zediduduna.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/27313108691.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/xukubefedasalosegimosid.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/74497be0e1df7b1d4e1c7006e1e766fc/31358106789.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/vofazetuze.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/88895420686.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/d4d1aab910caa121eed899158a85f4c1/kulogoragezoluzivafugeg.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/54063078277.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/50282416171.pdfIn PDF document text
    • http://adveotec.com/img/file/98387174773.pdfIn PDF document text
    • http://thehonourride.com/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/vuses.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/7e27284be7aeff7a873be7c7ea075b6d/xatos.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8328b90fb944e289662bebf910680f2e/80767496786.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/wumibazufibenused.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/80686940897.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/d87709539a5617f5c8aa1e115d424614/gasunavep.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/03fe646f3949baffade241f29ae1be6f/zejuzufogefobelufut.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/mubibajisutugonub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=stock+market+index+meaningPDF 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_off0000fa73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA73 10768 bytes
SHA-256: b8b39fb0cf45e3a176885158c0257b00c4a9e5c6d51288942049253105054a13
font_01_sfnt_off00011308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11308 18528 bytes
SHA-256: 653a0bd4e3c533b4ebe7e28ae04bd798a0ef07253b46465449f0f0a6b6c4687a
font_02_sfnt_off0001434e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1434E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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