Malicious PDF — malware analysis report

Static analysis result for SHA-256 de3639ceabffb631…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 08:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5a982ee7dfa13d8f12753fce10dd2aa3 SHA-1: d026b98f5f794347cb961c6f25b92cf49694cb57 SHA-256: de3639ceabffb631f499f475bb365dbb4a5b8ed35f9ccf5e0d150ea4e49cea58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories and disposable hosting, indicative of a link farm designed to lure users to malicious sites. ClamAV and ML classifiers also flagged this PDF as malicious, supporting its role in phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c955f70343---59245869723.pdf In PDF document text
    • http://patp1ryb.ru/media/file/64578642761.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16075f13fb4fdc---10105234278.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/milorotuvuzobuva.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/84756373134.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/48530494888.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/85281267765.pdfIn PDF document text
    • http://congtyvima.com/images/Download/tojawavor.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/ladilirokojagewitiz.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/ragamog.pdfIn PDF document text
    • http://kustari.net/userfiles/file/94507986321.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/38c45606b2f99adaf2c3972dd12fd317/88242472593.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/liwajulizirejewagufixodi.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/67029496586.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/39106234294.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/927197a5e4fd70f9f834ab12c7a5ed18/vavisemebarolonadopopiv.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/minolas.pdfIn PDF document text
    • http://apothepharma.com/upload/files/revepenasivevof.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d9618076c5e0aacbaed469d0347a4860/virugifojexig.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/30283633632.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210614162368715399.pdfIn PDF document text
    • https://digireg.li/upload/lirikunikelu.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/famawuzugiful.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=everstart+basic+six+battery+charger+manualPDF 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_off0000d9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CC 11064 bytes
SHA-256: 353919294ed522d2b2de0a95a7edf49000cb0d036256abf02227cd85d70a7fe7
font_02_sfnt_off00010b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B70 18648 bytes
SHA-256: 1dce367237e81e3e92c7652af76a21a00f2296f0751b8bdce4af9eccc7aea4f2