Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f1016fe8655d02…

MALICIOUS

PDF

79.6 KB Created: 2021-09-05 02:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 81269d67bfadf9feeab91a953fb60a3d SHA-1: 3c45262c1f119c0fb4f0845e8db45439645d6c7a SHA-256: 74f1016fe8655d02a541546ba1d50b9c69dca172f159bfb96a5a5ad357dac54f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads (e.g., WordPress sites). These URLs are likely used to host or redirect to malicious content, fitting the pattern of a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9c06ee9b7---zoxunesurudilar.pdf In PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ea8198bf5018d49a0c04fa10bc39b84f/wadosudojotukazoxaxam.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/finoraxizukejinojab.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/sinonomukovawuremawudarif.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160fd7aab79258---xelosatisipewajevimefusu.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/4190403191.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/4858b194de4f3d8ea4c5fa350d4381d1/sudamawetugelag.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/07tfd194odrftqf1k8700culgg/tibamedu.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16123b4ae46d06---jibimepufidexek.pdfIn PDF document text
    • http://fedoro.ru/upload/file/zubamivefugujukinaja.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/wowemik.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a8be5627f---pojesop.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f3cc2db15---ligixuwisezej.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/62020009936.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/51789496703.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609680ab4ba8a---digovipaxufasefamas.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/21b3aed674cb058b47b4e21d8dc76d0b/gofoneruxonul.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210822120654.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/63360892777.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/gloa46hkvpjto0mcnlpaechgkn/23882740092.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/7900135578.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/foxukofijeletituviv.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/29239473174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=thai+language+for+beginner+pdfPDF 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_off0000cb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32E 20572 bytes
SHA-256: ecdcdb8a701de227d17d7c1c1cb9e678c76a4c70ffdf254c8082ed0114069d6d
font_02_sfnt_off000118ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EA 10712 bytes
SHA-256: 5c67f3061ef9499d9f40e5f684635c46f53e2b65480fbaf7f0f3aa2917a04171

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