Malicious PDF — malware analysis report

Static analysis result for SHA-256 234862c9ed96c10f…

MALICIOUS

PDF

68.5 KB Created: 2021-06-06 12:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 959e61cc732d176a189fa6e1b47cbcd0 SHA-1: ed062da0f59d4b039d20591656e534017ed51d73 SHA-256: 234862c9ed96c10f9c568191477f911b03670658ee7c9ba87edeaf842474327e
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to be a lure related to 'Mat foundation design spreadsheet'. No scripts were extracted, but the presence of numerous external links points to a high likelihood of directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://wastran.ru/uplcv?utm_term=mat+foundation+design+spreadsheet PDF link annotation
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/ujvb4o0ta8p8da1b2mvviuu1s6/4753359884.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f492f1624---gowugowinomozodaf.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/63f0f72cde41b8ab15f3fa6a276710e4/sawusigare.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/4ab05af82474dc65f5edfcd92af35dbe/lanutoziwefajanonawefabuw.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070688425146---22364234416.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/cde133a96fa7f46c0825a70b52cbcf64/zoderebeji.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/o4643261s9nv7l04hj289t8n40/34055890334.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/8749754b85d0cf750963a1e40d586573/79015789241.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/13471267930.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/afd6eb4f18fdcbb89ec359b9051fe6e0/gurevogikososat.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2b5fddac2---xakikopikubobekubuv.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-2/20210502004655614742.pdfIn PDF document text
    • https://morabia.fi/images/file/55098665831.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/356ab2c32b76f212b7a0cd9bc94a4796/ripijetesijugejewepef.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/c74c6f46cda1c46f3ff5917db6539e80/41472504378.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/kuvebezuremezajomigivoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9D 5276 bytes
SHA-256: c7489df6d5e870e9e28fbb32453b32959c7b5ae48de61b67a12d6d023badfe9d
font_01_sfnt_off0000e19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19E 10528 bytes
SHA-256: f74acce1decd2bc89ec6df66b36ee749ee898c642885d21e58f34af5ef24eedb