Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdfcd2e95f222841…

MALICIOUS

PDF

73.4 KB Created: 2021-09-13 05:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 60e5dc2ad543beb648603cab1bd863c7 SHA-1: 8717014aa7b21b2b8c356a73519cf9997a6094b7 SHA-256: fdfcd2e95f222841174694dfe1ed5177912bd605d94f9d7bb841d98a2e5e4dd6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised CMS uploads or disposable hosting. This strongly suggests a phishing or malware distribution attempt, likely using the JavaScript to facilitate redirection or exploit vulnerabilities. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=liquid+medium+used+in+oil+paint+is PDF link annotation
    • http://arunimaflavours.com/userfiles/file/71451971253.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/24992487800.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/suwixuwobeg.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/fa58fb6aa946d29d020d056ff841887d/94244688547.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16130a014ce270---delosikisugijisukub.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/7fe2c6b446c82db36d004c774062142f/93985613753.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613351fc6ae1b---30919280772.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb717039d9---4363763829.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/49633377622.pdfIn PDF document text
    • http://dges.in/userfiles/file/zitaru.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/23401737671.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/xagawopubotusoxax.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/62351607673.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/8c35de9fca8e9ce8c286b09b8c18e77c/5757092974.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/81471830978.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/naluw.pdfIn PDF document text
    • http://keacg.com/upload/files/xirawomamamosujidetukex.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/68920871613.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/4898917063.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/162298541461332c55cb511.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/65629703312.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/46169169616.pdfIn PDF document text
    • http://samtekelektrik.com/files/jalimupezuvopepopada.pdfIn 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://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_off0000bbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D0 16948 bytes
SHA-256: 2149773ce050de1d2dc493f230de1b83cc244a722fb7c13c2679f280835cf3e9
font_02_sfnt_off0000ff86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF86 10656 bytes
SHA-256: fc8917ccb3fe54b0c02bc42c63b24aeba6c639cb0b112f8e99eecbfbe0799843

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