Malicious PDF — malware analysis report

Static analysis result for SHA-256 41157964781563ea…

MALICIOUS

PDF

90.9 KB Created: 2021-07-05 12:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f574c0609678ee8b3c3fb6cc56b7478f SHA-1: fe52b46c808d17d25d9cca3472271dc62bafd57c SHA-256: 41157964781563ea06aa3a21e6be24a8a40507254988ccb3efea8a3727052cfc
156 Risk Score

Malware Insights

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

The PDF 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 other PDF files hosted on compromised WordPress sites. This suggests a phishing or malware distribution campaign, where the initial PDF serves as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/83d5a92ff0638d0adad34c7afc0b1028/sakamegewutanonogixudipup.pdf In PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/84622924649.pdfIn PDF document text
    • http://recrute.fr/files/files/51583069543.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/gonazifififulapob.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160756e146a6c7---61850976719.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/tojovesososiriri.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/crv4s1ok12qdcqi9mmbksusoi4/49326228630.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5ff2b4165---jaredoxaki.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4002c83c24---89218303537.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/47910552053.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/47657686359.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7852dc93e4---80346579962.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee370e84c4---jegad.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/df7368ca825e249f7d5048474b74349d/jogiva.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160747f5e51f79---48791007623.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/95b196c3317c189221e5333e33eefd9e/76674386858.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/htg7blvnhk1kf8j2sa5vn464pi/bufol.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160adc86946ba1---66920266305.pdfIn PDF document text
    • https://wsbtitan.com/images/file/45349916971.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/94275530100.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/tulabusasi.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/b54306d238a713b1c27ce72ac198351d/79514100426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+wolf+that+cried+boyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE5 16368 bytes
SHA-256: 1957c7158e46d2a1fcea66bafa400ac9ebca94e16e515df6fcf3dbaa0e857b8b
font_01_sfnt_off00010138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10138 17096 bytes
SHA-256: 7561bde8539cc68b6dea8c01c87358e9afa75f02ab3c61a6018600a7dba9208a
font_02_sfnt_off00012da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000145be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145BE 10604 bytes
SHA-256: b91d4b130ef55388c4d77307fde953ece60f626652757cf203cfa2c32c3fec81

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