Malicious PDF — malware analysis report

Static analysis result for SHA-256 87dbd173191e50a5…

MALICIOUS

PDF

87.7 KB Created: 2021-06-29 06:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c585867882acfdd8b9805deee2c12df7 SHA-1: a8bca20326bb50aba7727b42af664f68e2ca67a0 SHA-256: 87dbd173191e50a5907541d0cc9611ad4ca9689a578a1b19e6f8b20793d6690e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly indicate malicious intent. The presence of external URIs and link farms points towards a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/k8f4lifepl6s1tuo1bol4b6lld/49853252179.pdf
    • https://kajariaadsevents.com/admin/uploads/file/gexuv.pdf
    • http://originalcheck.it/public/img_admin/file///bodejipakef.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7085ea578---84797044943.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/557558f1cd6659a081ff0fdb41265cd5/tufulapizodagogijame.pdf
    • https://pypconsultores.mx/userfiles/file/11374108725.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795ff7720b9---wuferulokurixofelen.pdf
    • http://aldo-ins.com/userfiles/file/20522095309.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607081498d26f---67681163251.pdf
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/dab160805a6bea290be131fcc3cbc8e0/38016494202.pdf
    • https://bookatowncar.com/userfiles/file/sorazivelakimopezo.pdf
    • http://littlepearlspublishing.in/data/eimages/file/3716294648.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085c42fa7e31---juzilunenavujadomojo.pdf
    • http://parfumkin.ru/files/files/zimejugobisipafome.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/cvo120td88718kl29mh9mhdrvf/monemijezobaxatutesudomal.pdf
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/9287945562.pdf
    • https://ludifrance.fr/userfiles/file/mikedijobibilirexopofivo.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608605818598f---giramifa.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d05fbd7f0d---kewapidozefe.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0f5dd48ab---rewowuzexemifezutav.pdf
    • http://aite-materials.com/upfiles/file/46037404269.pdf
    • https://cortopolis.ar/userfiles/file/lumoxudifipajibeb.pdf
    • https://kompaspt2.com/contents//files/95470825211.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a35ba478f---kamovokafozanupazupizor.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=resting+heart+rate+120
    • 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_off0000f2aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AA 16792 bytes
font_01_sfnt_off00010ac1.bin
9bde7ce45d4c4ebf34a31d5a9edaf69883b75a6708ae513b6b289900fbdf4610
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC1 10560 bytes
font_02_sfnt_off000122e7.bin
15d9f22d9e3b44381a20bb0fa8ff6564725890b714e4305cc46094f242c6ad7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x122E7 17324 bytes