Malicious PDF — malware analysis report

Static analysis result for SHA-256 8abc33b441440c8b…

MALICIOUS

PDF

88.9 KB Created: 2021-08-14 15:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b21eea4ff4116010a471567c4fe546db SHA-1: c4ad0db71719fe7283982c0d670d00cec9a47aa1 SHA-256: 8abc33b441440c8bea019115cab41494f36ecf17c3e3e3dca6ea5663bc4f7763
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or further exploitation. No scripts were extracted, but the structure and URL analysis suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fcd3c53ed---23090978108.pdf In PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210702045730.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/xununewunumejabazupum.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/93398133378.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/88bd5228086452ac1f719c0d4aa2a128/33922503624.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/c72c42ebe85ea92eeb3fdaed86364962/75779083572.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/qc2nlcgpi5mg8bif6i2ur9d9s2/55140315300.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021070322302480554.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/70251804501.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02a4a006c5---65266043385.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/21607458936.pdfIn PDF document text
    • https://reniuved.it/file/sovivijovaboxizafifonu.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/eaca600993e906a8795aa70eeeab9689/gepixajadejobobutax.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/a0626d3b2c8e88c066476c2d7cf85aa6/wememapumini.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/c70f457ac3e9d2faca8dfd604587d990/96602916929.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/d0d7d1134525aa6abef2eb3719c8fd49/7030084460.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160871f5ceade0---wevivez.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f985d2d8f---jejijapuzejutebuwe.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608720e084c23---pezozavekomubajipe.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/ulv5o88pqq7b2qk5iapk7n5img/8432124193.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/64866860085.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/28205848167.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160777f1a28a3c---misuzor.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/8709636791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=jerarquia+de+operaciones+ejercicios+resueltos+facilesPDF 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_off0000f23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23A 18672 bytes
SHA-256: b2c1fdefa23d48cc1ba44c2cdbb13d14f37b11556e204991721b4df24adb25b3
font_01_sfnt_off0001221e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221E 10980 bytes
SHA-256: 69a6715972ffe1609b143f7c71e81c880fb53505fa0bfdad6b5b8e5af34ecbd7
font_02_sfnt_off00013b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1