Malicious PDF — malware analysis report

Static analysis result for SHA-256 48cfccdaf2cb5907…

MALICIOUS

PDF

89.1 KB Created: 2021-08-07 10:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d1572024410c071cf2dc6bca0ccc7786 SHA-1: 68ec312f6d40358bba591d9fb38f2fd4227a438f SHA-256: 48cfccdaf2cb590782f1cd5f44a656d4e7e96b386e59ef75f8c259e6d2ea83ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://huntic.ru/uplcv?utm_term=how+to+stop+knife+crime+in+the+uk PDF link annotation
    • https://kraftyz.in/ckfinder/userfiles/files/rovofofujal.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d44818bdc---32398471167.pdfIn PDF document text
    • http://sapaethnic.com/webroot/img/files/63276164271.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/7777j0bgon8i19ogo2bqttensp/fumixigemalogovewo.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/xotezotagiwaned.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/29381365468.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/wuvomuk.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/33564715237.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/wafev.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/ruxuwisimev.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/97b7759bc3d54f31d39188649c72249c/15988242271.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/lidujeresodome.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/97738399382.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/megopegibefubumuka.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094283bdd700---96805720126.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/4d982dcc098c3c360ad642280c830c89/25679193828.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/resobuzomovevax.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/31efe25b9217464336c91c584bec1baf/78409017587.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/kitabimazurefenusaze.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/98042216745.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c6ce8a4d2---wurugo.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_off0000f892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF892 17048 bytes
SHA-256: b7c4fb1eda8bc463e7db79eac11ebc8e0aa317e15d41a604f33cbd10e0d6b4e8
font_01_sfnt_off0001249f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249F 10808 bytes
SHA-256: e7b0c843b55ffca7a50e61f97e1bf2ba4834b0df11a359ffbdcfefb75157672b
font_02_sfnt_off00013d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1