Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce5ba88ad8e28a34…

MALICIOUS

PDF

76.0 KB Created: 2021-09-16 05:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3a6878d3de70d18b0b1ddc077889e001 SHA-1: d91e374030f811d0d34c9a586cfeca22eae903b3 SHA-256: ce5ba88ad8e28a34fe2c4e1c8412917eb47a61824b69f52474b54966de0e0568
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple potentially compromised websites, including one hosted on a compromised CMS upload storage. The presence of external URIs and a link farm structure suggests the primary goal is to redirect users to malicious or compromised content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://americandeliorder.com/uploads/files/25957122450.pdf In PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16135961863ca5---tumevadafutusa.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/sejamufager.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/37874655765.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/figiraforafaromite.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/legowasojaxigexab.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/46228377282.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/17539482611.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/jomazedobosini.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/mimudiruwiwezikikajewe.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/baa7884edabf0a2bc30bc0d70ab8b093/tonamipivefesituran.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/gijizajowunejasenaduju.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210916060514.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/jilesumopupabizuloxo.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614095a50e11b---60987684260.pdfIn PDF document text
    • http://strap.sk/uploads/files/52704500258.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/82059821640.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/miwedovexokilazi.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613b26ba3dee3---73939739135.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/91782211398.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/59858877084.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c110259ec7---40152529392.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/rewonofatinuzajokiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=david+icke+pdf+freePDF 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_off0000c975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC975 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18C 10236 bytes
SHA-256: ecd0da79a3c173b593a25e57cc3d5d0bd5ce7e9b907514e9c98fd076e3c6c08c
font_02_sfnt_off0000f8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AD 16484 bytes
SHA-256: a5534767589596c85f706a7629d435d38523a924a0f80b146c3c12b0410c169d