Malicious PDF — malware analysis report

Static analysis result for SHA-256 41fbe1a7b1bc3c7c…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 03:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7b02f4fc1e2f140e1777b1eb9eb0dd8b SHA-1: 97422d27d555c33aa2e107c23a9f2c6ae01bf420 SHA-256: 41fbe1a7b1bc3c7c239c3bc64865f187c9fdd2036a19dd9d2482af276e43941a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm hosted on compromised CMS uploads, pointing to numerous disposable domains. The embedded URLs suggest a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=meaning+of+curriculum+implementation PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a68b7bd8b---gidogopoda.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/58037724231.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/32910752770.pdfIn PDF document text
    • https://nls.vn/upload/files/pugenavalabagu.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/raboroli.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/mipujagase.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/16335184455.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16136d3e34d59e---35034155692.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a14594b016---3469713469.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/24531495724.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614e51321a5d1---68840565137.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/titerusif.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210907170019.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/pinetenap.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/13474117553.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0048b933e83022c4addabb07b7a485cd/duzazojiwilajuranukatepeb.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613032745e219---73044563113.pdfIn PDF document text
    • https://energooptima.hu/upload/File/61375491377.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/jawesarik.pdfIn PDF document text
    • http://dienhoabacninh.vn/webroot/img/files/2241280984.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/93681884664.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/7dcpkt3l0e56uc3sjl1f37lbcf/7090058631.pdfIn PDF document text
    • http://webbolt.fono.hu/data/editorfile/kigitoxagozafa.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_off0000b24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA65 10748 bytes
SHA-256: f3f84e1579a4cfad3c8859409ff4afe5d33fc2fbed9b2188783053c77cf71948
font_02_sfnt_off0000e30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30F 15816 bytes
SHA-256: dc0e2c9b32265d68f5793601ab1e24f3a8093779acfa081a2182a1f4f62c4de6

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