Malicious PDF — malware analysis report

Static analysis result for SHA-256 606bdb409a0f8f0c…

MALICIOUS

PDF

73.3 KB Created: 2021-09-12 06:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d75a72122a01d3f1edd4b25167eba7f7 SHA-1: 9bb7a72ced33d6fd568f561bc85b0efb53518f67 SHA-256: 606bdb409a0f8f0cc57f8aa9cc7bfeeda7931d73d3d96b2092006e6338523d4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. This suggests an attempt to manipulate search engine rankings or distribute further malware, aligning with a phishing or content distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/2qeeee339j8p77eqoalpdjn19e/23715839392.pdf In PDF document text
    • https://techson-cctv.com/upload/file/23981865010.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/99042499363.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/14496730060.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/78095406540.pdfIn PDF document text
    • http://cartopack.be/Images/file/46649179573.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/zirokebadanikajepi.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec5d4879c6---12779880419.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/35075194661.pdfIn PDF document text
    • http://youil.org/userData/board/file/zujalakisizow.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/robolegegipowolofakuzaf.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/88943356680.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/tazododutudodinem.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/2104175836.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/wodivanunotejeg.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/zulodunez.pdfIn PDF document text
    • http://asvpp.fr/pdf/38758582420.pdfIn PDF document text
    • http://ailizia.com/userfiles/30266751364.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/697330b9d10731ec9302ef9d70ef5b5f/44361013769.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/77143032250.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/86472851334.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613165d7974ca---28813653713.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/fcd91934480133a78e21889dfc02fd8d/debubepinetavar.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/41688751565.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/75716803953.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/wururuwezokesuzifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=blue+waffle+urban+dictionaryPDF 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_off0000be46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD658 15692 bytes
SHA-256: 971b2f94af9a79854f53e2f82a6545ce810a6ac44ca2f75706d14c9b52e04162
font_02_sfnt_off0000fdfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFE 10796 bytes
SHA-256: 1a9857b7c9f28c87e7eb4210529a032795d57f5190b8206c5efbba35318b8036

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