Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15ec44f0adb9e29…

MALICIOUS

PDF

94.3 KB Created: 2021-06-26 13:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: dbe7943d453919103c99242062939b48 SHA-1: 755d67bcc025620148e86d741be183aa46f0fe03 SHA-256: f15ec44f0adb9e29d59d76a3efac953777c2235808796b50a80372c1eb6d5d14
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially unsafe external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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 http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b8c5de769---fenawezedegebajabu.pdf In PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/wekofubutopasapapax.pdfIn PDF document text
    • https://wagaskar.com/media/godul.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/9ca6afc7c7e431f6fef4c7caafc4a31a/xinixokisexopijonazibe.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a0f8be0b7---2422649060.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/8f755c918d1c9f91923b443edd36644f/rolivemugatekezokap.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/gebimuzaxagib.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f0321b947---88529689623.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078afabb345a---75276341630.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/55092821811.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/07f54632d168ee5e98af20e342a4438c/50930345436.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/21ca36ef6d7f9ac7a1ee65abe045a478/laweseze.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/t55on4dhhq4b7m298m9a9ujoo0/sogukilubupifon.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/jevijubexogemituno.pdfIn PDF document text
    • https://davaocarrental.com/images/file/40042264562.pdfIn PDF document text
    • http://www.shadowrangers.live/img/files/91506127792.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/24176837585.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/455b64f4e8831bde41862a82f0202b4f/sutiseralemaxafunakikeg.pdfIn PDF document text
    • http://synowka.pl/galeria/file/wadifimiwimineb.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/fbb83846f4989082d1f072a80a5e3913/41108967880.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160797ff087416---89599448916.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607faa684f9d8---vurukifazawe.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/vaferidozilubomosod.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/vufefibudumonawum.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/4llubf3o0ctqj1qr2pa6qpj0jl/22113529277.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/palelidikowebo.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/metuvuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=rsretail+time+entryPDF 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_off00010ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA4 18440 bytes
SHA-256: 4bf9d5810265a334b399f19b4085efe3c22128aa81f0ea6270f72d38477a8486
font_01_sfnt_off00013c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15485 10308 bytes
SHA-256: d5d9eae4ee12c80ccc5205a6835e25abaffc09b0255e171fd5e87613edb65de5

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