Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ae3667ab2dc27d…

MALICIOUS

PDF

84.5 KB Created: 2021-09-06 16:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9d591aa78c9d40e5d83da1580098ade4 SHA-1: 78a9f54c142d93797360a323ef560cc33cd1e155 SHA-256: 43ae3667ab2dc27dc155b541de98cead26d268b1c24799cac88e47b14ddc2be3
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, which in turn host other PDF files. This suggests a link farm attack pattern designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1eecb8027---tevifupaga.pdf In PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac86e70d943---wupiwaduzi.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/wobizekupavimivuxevoz.pdfIn PDF document text
    • http://hydrem.ru/images/file/sebupabilajop.pdfIn PDF document text
    • http://altinay-law.com/images/file/77609290881.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/d555606dbacd5e8d16db8e778bf8ffe8/54506331002.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/8232475250.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/8jlrt5lntoup3n77193qva2de5/49374000992.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094035662711---nebefirubobaxodunere.pdfIn PDF document text
    • http://ruihuitax.com/files/file/65454451493.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/71116948290.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/31136179808.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/15d77eb95a315ba395e0deaf1405224c/woxamepeboxovajavugot.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/22059253822.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca34390eab---mapizej.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9036b7e11a---71129380439.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/bavojubinolotakizimopeveg.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/45005283189.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/a3c09b5a31c13585660ba339722fffdb/zelisegefakis.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/56141895790.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/86034235530.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/64721755211.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=marketing+communication+theories+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_off0000e8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B2 16116 bytes
SHA-256: 72a1505896bc3f2cb016b51d0c9cc3d5c72cfbd95d08d8fbea7eb01af34f9cfc
font_01_sfnt_off00011205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11205 11208 bytes
SHA-256: 3e872f76343eeddd0f46f6e7dd9baac38a488ccd2e4860ec5386e17b08baaa72
font_02_sfnt_off00012be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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