Malicious PDF — malware analysis report

Static analysis result for SHA-256 a438da877e546b69…

MALICIOUS

PDF

111.5 KB Created: 2021-09-01 07:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ed90f6e11dccc6ddd488239171d5d87f SHA-1: 45ceae084fa2dd8ed6cf91a03d8cbdd2fd2f277f SHA-256: a438da877e546b69e51c0cfc9ece68b1a9990da65e498cef32fc7fe4c17ef6cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure suggests it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://giverny-bkk.com/upload/files/49205857134.pdf In PDF document text
    • http://labonscafe.com/userfiles/kajixa.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/adf20581693a620cb9987447e966e370/98462929877.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b55c7bbb60d---sopoja.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/delisija.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/08483f7a395dfde0417a97839a1d77b1/55633158702.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/7dm91jjr7cpfbd2mincqhr2hkc/65089025015.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c132d7b24b7---makokog.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/54129847149.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/94ba527a6c7491903f7eaf1de918f0e7/34878911879.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210518055005112.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/76644663241.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609039e09a35c---41289031780.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/23442240083.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077941a33184---77337565699.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/tujezusik.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/8oi0siebt6vqp2f2ccn7g18pd1/waravexubivisuke.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161173318c3d61---lexukisur.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/t64e3enlf9moo8kea5ijj35vts/53495489870.pdfIn PDF document text
    • https://bem-sa.com/img/file/niwozaretapazovut.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/38725445031.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/48255153069.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/95300379839.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/82300189371.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/63710204102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=about+the+book+of+exodusPDF 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_off00014881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14881 22036 bytes
SHA-256: e31649d0f019ec48c70ac9a1b3331335b7360f599ed1a6b91427b8ed086b80c8
font_01_sfnt_off00018049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19860 10364 bytes
SHA-256: f1d4c7b086a1941897d6e85e553dfcf81514c2125f678fb2fc173f866acbfd6a

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