Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e9e84a62cc0786…

MALICIOUS

PDF

99.2 KB Created: 2021-06-27 10:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aae625c58301e985a26441bddf714bda SHA-1: ce7e07a446085f81d01a6b76374bfc587f33cd25 SHA-256: d4e9e84a62cc07864764e582ffa1e87e87f03ba82ab458199a4dbe598aef57a3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely intended to lure users to phishing or malware-hosting pages. The presence of multiple distinct hosts and the use of formcraft plugin upload directories suggest a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088dcf445887---44578517096.pdf In PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094baf1d542d---65113332756.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/uvipmb5qk2g8ldpu9vklkv6rc2/pamotazixobep.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/nexaji.pdfIn PDF document text
    • https://puppometalli.eu/file/dukudaxebone.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fb1d71371---tegobakasazodulimanu.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210517234727.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/skeg0a2i2qdds63i4g8f6b6vm4/kasokiz.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/e82b425a14bffffc8395adf1ff5d77f2/sidopep.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcc54943cc---72348316750.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/cdsjl6k5vsi2lidn2citn6hhv5/janesijuwefez.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b18bb3d5c---75428736089.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/semiganu.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1f8cb3cbf---76666279950.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093d0572b778---54514841339.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fec09d89a---fumuninefatikenirud.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4a36e0438---luretewozul.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/38f7f3b2f0f3cdd890af596b6d2290d7/4087268054.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/a7f08bbcdd7ccda0a4b3a78cf490d00b/89813544123.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/rv1035ggena8t6ql1vpqpndqe0/vubotawamize.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/14197280145.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/gibatabulu.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/99105254987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=300+bowling+alleyPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/a6984c4986f6619f8dbe2cf6da4caeea/41399767072.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_off000121c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C2 10456 bytes
SHA-256: d569dca53eb66555fa4eb375971be7336d06e4b10b06b97c9e88c7dc0530d068
font_01_sfnt_off00013996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A8 17628 bytes
SHA-256: 8c2c00d8033d67377f682203cdfefd80f0c0e33eb90fa0060a43453fdd0be064

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