Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f502963250a8364…

MALICIOUS

PDF

88.1 KB Created: 2021-08-14 17:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2d19a79e2292abf1f7c8e4cae855dbf8 SHA-1: d41c8d530b21a56347193e06cb02a64672676a1e SHA-256: 0f502963250a836403ba39b77ffe18610a65a7a188869c333e61c883586436c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous URLs, including those hosted on compromised WordPress sites, suggests an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc86d592ccb---niwiroxizalumuk.pdf In PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/6eedhh3304udlvvup8dfe3b1g0/vakabuk.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/am1o3hocejkpp9cskmd2buts30/nibitujobizivadoj.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/gijezowatos.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cc34cdd15---2653494181.pdfIn PDF document text
    • https://hoavily.com/uploads/files/46808284008.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05b59481bf---91028931434.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/29587141846.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/43cd1dca46d74dbfb7b5ff539983eaba/juliruvinukanosuzajo.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0144aacaed---90524655510.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/c36ae7a7ea8062ae4d415781660e57aa/womosejozot.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/buxegadoburamugajowi.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b27801bca1---70498724549.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/5e5k5k4qnmkefn0uqeaq0lhjkm/19697093717.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/nudetovabanov.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/9246268506.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/768fgk05k7nodeajdtksmrbuj4/26593984850.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/sunugalepixiduzigokiwo.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/jitafuxez.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/59679165982.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/57850350765.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/gopuxirelebagiwuvoramas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=latest+hollywood+movies+watch+online+with+english+subtitlesPDF 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_off0000efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 17996 bytes
SHA-256: ff468ed68a1a8a4b26fba9c07c5fb3d21a7a0175e0e17d12b0686f262569fb4d
font_01_sfnt_off00011ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D4 11180 bytes
SHA-256: d167c006602a1f2a0800f5a7444ac3e9ee483db865e5a23fc9e3837190dc2920

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