Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0df8b0573c77270…

MALICIOUS

PDF

74.8 KB Created: 2021-09-24 17:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2d8017ee081695f13ccf205551cfcf64 SHA-1: 70f44b5ed2235f499a538c1b52a554bd8cd5cae0 SHA-256: c0df8b0573c77270e529f7b1a1b33ec59e93239ebcfa2bbf7962d20483c6b48d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external URIs, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate the document's primary purpose is to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://irlanc.ru/uplcv?utm_term=recover+deleted+message+android PDF link annotation
    • http://antonio-pelella.eu/userfiles/files/58151393126.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/501721340231548dde3f2133e9e4c474/powidijixebatinuni.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7bfe373c0---60652641686.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/97681992853.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/bolobexibufejipasefofog.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/34904123915.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/kenikubukatipalomowiduj.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/berodolilokitabemi.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/xolamiwajuwe.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/jupibepamegapona.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/nulokujibob.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/6tlr4lchkm5d8cfs1tlm6pi9kv/65511344812.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/26416008240.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/95537781960.pdfPDF link annotation
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/zuwarukemidowutur.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16143a17149c0b---7425599901.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/53979828131.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/gigolixapekomula.pdfIn PDF document text
    • https://digireg.com/upload/sovekubafabudaxatapadazi.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/33416519994.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bba3d61e0a---4265196291.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/19524202352.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/26043991564.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/bunokuzonetexug.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_off0000bd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56B 10824 bytes
SHA-256: d0af144be3bf5de83bb5b90c1d05dee606b58f29fa93ee4fa4f25a498c6c489c
font_02_sfnt_off0000ee31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE31 18196 bytes
SHA-256: ac11a1d4dc0c46ce496cb1a68237816167f50ade7cd4e7e8e935c16376cb8b3a