Malicious PDF — malware analysis report

Static analysis result for SHA-256 4855a6880da43892…

MALICIOUS

PDF

79.9 KB Created: 2021-09-11 07:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f4dbb8ffcf2fa6ae52ea6c161ae6be92 SHA-1: b2d1db3c1d1910a2d28f3288458657c2042614fd SHA-256: 4855a6880da4389273181f864ca0b13ccaed204f1a686da12932287fbfabcc8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of external links and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://haithuanphat.com/uploads/files/8037936554.pdf In PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613516012d841---85921876122.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/22506398590.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/40740085802.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/xuzegases.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/rogatuvij.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30397956650.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/32554262675.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/91752943835.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/dumibuzotafuduvukejo.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/jutifakexuwiruwivuboz.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/lufomokowenewatijen.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/zenelako.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/dobakofurazi.pdfIn PDF document text
    • https://membermimpi.com/contents/files/lulubo.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/voruz.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137dd47e9aac---15086439492.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/sakupom.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/gusidawanavukepakir.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f19b4501bf---83598642333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=zombieland+double+tap+full+castPDF 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_off0000d2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BC 17868 bytes
SHA-256: 2813e5f2a08bde521a296081718f80deb05884a37f259058adc6c895baeb42d1
font_01_sfnt_off00010148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10148 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001195f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195F 10884 bytes
SHA-256: 0382908561e9622f522a51d0a04ad04c6a424aa5dbafa9990715c809e052ca7e