Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a999e77fd681ad…

MALICIOUS

PDF

81.1 KB Created: 2021-08-12 04:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a073a832c439e126d7323b14f8eac4b2 SHA-1: c39a946b0a70f7b33f8af3284b40972275bcfea1 SHA-256: b5a999e77fd681ada23e745358bdb72518e7d704de0f6170950f13f9a3839526
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to disposable hosting, a common tactic for distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns suggest this PDF is designed to lure users to external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://agnieszkapawlik.com/userfiles/file/zitete.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec0fedc415---76178479707.pdf
    • http://grandp.ru/userfiles/file/91754696475.pdf
    • http://artecgroupservices.com/imagenes/file/71385906471.pdf
    • http://industrialdevices.in/uploads/timave.pdf
    • http://risme.vn/files/tawirejuz.pdf
    • https://murderescape.com/wp-content/plugins/super-forms/uploads/php/files/fe99b1fe148d6e01934761958f16917f/57337779404.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/3b7a9f40e0c57f90b42fef530ee04522/27006372042.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/54615e71c13f5026a0c9d4232cdd3028/66793341422.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6e20378df---74968695484.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096a1ca41aca---vuvozeruwuwolizilopubupi.pdf
    • https://beautyyaurient.com/editor_upload/file/85228651348.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c117bb12ecd---1364605177.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/a98a28ca9d2cf98a7d075c36f5af5347/bosifupomexez.pdf
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/98046345283.pdf
    • http://gourmethousemacau.com/UploadFilesfile///zemofirovigipelemi.pdf
    • http://thevelascofamily.com/clients/11614/File/91912622463.pdf
    • https://conexkarvan.com/cache/fck_files/file/41005804476.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdeb3de97e---60094138499.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a309a324e15---71157246308.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/l5gtm6ccb6vo5o0mesvkj4mh16/jaripimib.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fb50a13bade---26296774670.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=aiou+degree+verification+fee+structure
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da59.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA59 16792 bytes
font_01_sfnt_off0000f26b.bin
8f9e2717ae7e23bc1e5fdb9deaaf8a47f74deba604e64b5cc7ac478ebeb58661
pdf-font-stream PDF embedded font (sfnt) at offset 0xF26B 16776 bytes
font_02_sfnt_off00011e2f.bin
706f085d644d48b4deb20a5d767d1d7e839de90761ecd3d49f1ea7618334f99b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2F 10752 bytes