Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dbe5f7e1f855e8e…

MALICIOUS

PDF

76.9 KB Created: 2021-09-03 19:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: de48a9461f8937823fa472d5a2ba8f5d SHA-1: 05da3ab5351f23f4ac5a80338c6c450b03640ed2 SHA-256: 4dbe5f7e1f855e8e64bab3838b9ed5efbbca3e7e115a27b185b59ef5939eb6b5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to lure users to malicious content or phishing sites. The presence of these links and the overall structure strongly indicate a malicious intent to deceive or infect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834d289c853---85400680600.pdf In PDF document text
    • http://deleersnijder-bocaege.be/images/file/buxudajafezegurekesemi.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/71748674769.pdfIn PDF document text
    • http://dzbnf.com/upload/file///9591008360.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/vutobijamuwawifogivovawi.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/zofokamolu.pdfIn PDF document text
    • https://kimcert.net/E/file/32649403407.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/nju20r046uceq0gav3glgutmib/33610930062.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/paxefetatud.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/merozafazagomozito.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16078416c26d3d---fabataxajurob.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/zonoxamexadefefaxa.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/52196651196.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/44243212870.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161148ce2c22f4---xipazasakomutawosi.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/supedozigevek.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/movukuxikitujede.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/31adf37138360d3b7fa4a99bfb62a4b9/vopezas.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/g2q6t3q2m56vfgfq3t9gmdi3sm/wuvomogorupunuzojokolo.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/75993493195.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/f17b39601ded4f2413d6e1a41976e894/nulijokuwiredevumukedit.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/tifanu.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076fa763c32d---64194280271.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092c91436362---papalavagil.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/30b68aa0198f383f2529b460c6b7fc98/98638705457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=fifa+world+cup+schedule+pst+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_off0000c710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC710 17480 bytes
SHA-256: 16ff09c969c9a4ae8fb8b7326297788219efbdd8e5cb4d0c9138db6cbd8db255
font_01_sfnt_off0000f4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BC 10776 bytes
SHA-256: b3c4b6dd5233438a7ef6c50d98bcc44d7974211d7cdf5a64bbb865563bbeaac9
font_02_sfnt_off00010dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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