Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4fdd7a307d5ac9e…

MALICIOUS

PDF

89.2 KB Created: 2021-07-05 05:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93e16839060ca0402f9da475ad8615d6 SHA-1: 7b69916deb2286940acc33dae9e60597a880219b SHA-256: a4fdd7a307d5ac9edbee8993e1be6fe07f70ca3049165af3ae23510ce79428bc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware, suggesting a spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://aucoindeshalles.com/menu/file/71150263098.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/c6f2fa30be2d7f87730e59fb43ee3b51/fefudebexaxirigas.pdf
    • http://daoltrading.com/userData/board/file/92336895804.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/58344c3fd0aa2aedc9f7c82f5df178e5/gatudawevatijikogu.pdf
    • http://sbnjl.com/userfiles/files/84125222720.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160785a7367523---nijibewamigab.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/33fa96b31b32d8a15003f8cc39ac2917/gavinorusukizu.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608c00cc10101---gidebabexewamolek.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c926573e4b8---mowejok.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/goao8nj4p3uoka89919hqkvem3/mizenobo.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075de5531485---26270487641.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609421bae827a---xitukogebozulo.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ed307969d---9915091010.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160732e4ac9db9---xunetunirelujurul.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d0cd71c5c3c---rimejususame.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/m7ihoapfbtmhve3dfdt4bu0134/93184881160.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/f4gas920u7h1fnptjbihoth9c3/divusukuju.pdf
    • http://adabaskimerkezi.com/upload/file/57859133386.pdf
    • https://dock-levellers.com/upload/files/16658813257.pdf
    • https://communeouchamps.fr/userfiles/file/6918408220.pdf
    • http://stacjaregeneracja.pl/userfiles/file/38201258315.pdf
    • http://jan-fotografie.nl/upload/files/22005519520.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/drg58ip1h2gatj4gudiq55pum9/wepiva.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//madopubasasagunowim.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/uljek6iomb7omoqt0sfiaas7eo/nutuxisubekimel.pdf
    • http://studiogiovannone.com/userfiles/files/gogukebetekolif.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ca6bac38b34cd8e27b304f24f3f14445/16883565008.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=cat+2019+verbal+question+paper
    • 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_off0000f7e6.bin
691d388954529c30b02f896009d86a764d8a975b703bc556f98ff8621bb54926		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E6 11188 bytes
font_01_sfnt_off00011213.bin
f079e4410fc42de96d231973d254d66ebe111b9aeb5c731661167f4b8638dbc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11213 17284 bytes
font_02_sfnt_off00013f6e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F6E 16792 bytes

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