Malicious PDF — malware analysis report

Static analysis result for SHA-256 521768c122973e68…

MALICIOUS

PDF

76.2 KB Created: 2021-07-02 00:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9e8e5904cf889ce947fc28530c4db5a0 SHA-1: ee7f54c751d67da8c6779fd59ed4d0c9f23f8de0 SHA-256: 521768c122973e68862e35ee1ee31eb3c9ad277b0c45bd7b0053b6d380b6f602
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to potentially compromised CMS uploads and disposable hosting, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/4385c9173e6c8cc78656fa8496b3ab3b/niwibaxu.pdf In PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/3fddf404de0205068a4f3f663c3f6241/69619786825.pdfIn PDF document text
    • https://jurad.eu/files/file/83212705829.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/67525104165.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/85557809519.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/062mon3t0m3nmckcnapvl5naj0/53875921541.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/46382335859.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/c400d4e187206d18b7a75c294b20da7f/vajarezilopitetuxa.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/punovadijikixuluf.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160742f96efc7f---74981085046.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/73376648815.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608462b3e6962---9114971120.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/28785822633.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089176fdb07e---timabuxaputenolizigibad.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/56096817564.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/73542947347.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607432b3b4e51---fojulubozosugi.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a534dbcba3c---91161226567.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/20213960146.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/8acf9d7cfab6d55ae9776c794d40a221/99121702717.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7a6b85376---pibitagakidalatevediwise.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/2b771a3b3db40078a908ac56a85fe5f4/67834220255.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/6b9869860adeb4acaf13be6d385a921a/66525352850.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/funokofutodixunegape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+stop+powerpoint+slides+from+looping+automaticallyPDF link annotation
    • 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_off0000c324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC324 17820 bytes
SHA-256: e5951c6ab8057ad44c6a4e312e2003ae6ed88707fd3a3f7289cbcef202552a22
font_01_sfnt_off0000f0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CD 11252 bytes
SHA-256: 979dba7911871b4ccbe952e67343963ccbf55040dd7e5018c4af47cb7adbfa2d