Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4bca49c95100ddd…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 16:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1353d8cbccbe2cd6fbe90bb1a5abce43 SHA-1: 3795b8bef0a5155144d533904cc3a6c9c4d77032 SHA-256: f4bca49c95100ddd237c37822c06ba402c57e43c5d5a2bd991f8946cd911331d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://0286869143.com/editor_images/files/71893995609.pdf In PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/tozumozi.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/wokivagidokiwevulen.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/vukomilesepi.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/10537296163.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613526f4c8f42---penabosexewebubusevuri.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613673fa66351---lalemav.pdfIn PDF document text
    • http://pb-book.com/user_file/file/59796940566.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/fibal.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/64664f7f2cf6d28af90ba8da8e71d6c3/74648068056.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/5c571cd5727f92d0d97c0b6f61577137/61097202269.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/30035094156.pdfIn PDF document text
    • http://scsytech.com/upload/files/tajop.pdfIn PDF document text
    • http://farmina.ru/uploads/files/12539631284.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/xupagafutupevukewe.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/31640614469.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/3480745958.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/wozilujojuzekadovejufej.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///bibifixoxepuwogotaruzi.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/xidoxugijup.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/45760203198.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/19681443081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=mywifiext+default+loginPDF 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_off0000db28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33F 10656 bytes
SHA-256: 4a9133b6891ab7efe0c4c49eb7a21e090056f8ad94ec1ef23dcf71ee231cc276
font_02_sfnt_off00010b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9C 16952 bytes
SHA-256: f5854659acb5175d8a95e529b2f64eec9694289173aa5e3320066903f9028847

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