Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ea9b91e19a2827d…

MALICIOUS

PDF

80.2 KB Created: 2021-09-06 17:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ce1d131cc9f9ff5586b6970e3cd5e252 SHA-1: 9daab9dc6df99481cffbab379e9571b2e5a32e40 SHA-256: 1ea9b91e19a2827d4f1046195ed59f1fa65ff3c0a2d69d24bb846f5678a4a23d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns are strongly indicative of a malicious document.

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://ahkjt.com/upfile/file/6708295367.pdf In PDF document text
    • http://mea-travel.pl/userfiles/file/28449062131.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/46871c95sd925201obn3l5ejb5/nasotagixutu.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/nmktnt8kms97u429s4agq0mlv5/nulazajuxolepixosogo.pdfIn PDF document text
    • http://sun-eko.eu/files/file/vezudezazulanudugobulaga.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d16ed81493---10300858599.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073723f39329---87128019325.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/zetifemekekopinedewupefa.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/xemedanoxovipudowufo.pdfIn PDF document text
    • http://trevorhannant.com/34172831031.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/40229898086.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/givipogovasasir.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/74f26984d0910e408e098fdedd4188bf/joguludixusevo.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/11431025112.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/dudewasose.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/6178b6a73bbadea2ae55b650488dbc98/49926870329.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7da90f246---36187892662.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a815187a13356fc58919215ddc903eb/72192097399.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/ruzedidenetujogupufex.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/4vt29uvpkb7c94nq9e9mkm8vvn/jodasub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=chief+architect+user+manual+pdfPDF 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_off0000d4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A9 17664 bytes
SHA-256: ee90e44a052803c2aa19fb64bd1d8a56832d0d56f737986395cf2057c42b09fc
font_01_sfnt_off000102a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A7 10896 bytes
SHA-256: 59232e97a760d6296f00926b9c4f7fa82139d1336906528115248e1f84912409
font_02_sfnt_off00011baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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