Malicious PDF — malware analysis report

Static analysis result for SHA-256 41de42d9dc076737…

MALICIOUS

PDF

73.5 KB Created: 2021-07-21 17:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e13ea1f32ab33c54826aa13f139c4e09 SHA-1: 042a0a1d41c3cfefc06112511e343e21f595598a SHA-256: 41de42d9dc076737aabe1e1c3b07e0d762c93cd8b693a4def0362175e3a88d4a
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/jlv8ui1mv5uodagj49sjuoriv0/lugul.pdf In PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f126045f38---disavipulobaxerefez.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/gukotaguni.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/duvafexi.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/a939f69348741600e062fe915477c9d0/10697838581.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/mthhememjvsbvda7ngmikespi5/wurexesidutab.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736e67a3b0e---89899261678.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/86843619858.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///jisimebibinivetedibifom.pdfIn PDF document text
    • http://orderkai.com/uploads/files/64782546534.pdfIn PDF document text
    • http://minhanh.com/files/81516716178.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160db9f5c9cb8f---33825671607.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/lazuzujuzotenud.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f488208cc1---toferekibidesi.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec61aa3c3a---buzat.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b530488994---zumugananowesogoparali.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/46519354729.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/sibotizezakovozavonavi.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/fb48709458d7d5f661588e5c46c61096/kezum.pdfIn PDF document text
    • https://ckmusicdesign.nluserfiles/file/xavimejefakov.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/7c3237b623822e15156f3ef3f0ffc6dd/danuvun.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/30830955285.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074dc6d46b76---wovejevanowikulibovove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=prove+that+the+line+segment+joining+the+midpoint+of+two+sides+of+a+trianglePDF 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_off0000bb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0F 11228 bytes
SHA-256: b0bc3fc1c3dbc972513988910381ec75fb4634eeffbfc8272f499b4f17ab5c53
font_01_sfnt_off0000d4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FC 16284 bytes
SHA-256: 307bdd7042d7e58276040486ffc0b3f5c986a1837240b0b7f909a4f8ede1fb2b
font_02_sfnt_off0000ff4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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