Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa6592fe13c76a6…

MALICIOUS

PDF

92.4 KB Created: 2021-06-25 23:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0802e5561b6bacebcb4a51bd54a8360 SHA-1: 63fc22486f8f2faf22ed456be48bd4d50fee7b68 SHA-256: 9aa6592fe13c76a60cc9218e7003605672705fd940a846169b024f41a73f96bf
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 phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the heuristics and URLs point to a link farm designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/788631aeef0e1be8a68af41e10b99ad2/kunalapagumef.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709e7805393---subonixepuve.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/19c1f331c72a792f66517b5c8f08515b/8977186582.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb4bf08645---79922367887.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609520efd7412---83940816531.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/3vf14frdsg5h1adsd9bfaierjl/lukodugos.pdf
    • http://gancza.pl/userfiles/file/jutejimavokexurexope.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06469e663a---80281244230.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd749aa271e---mojunelave.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/rmjhgp3begpnjjj6fesljd07f7/nogep.pdf
    • https://associazionedynamica.it/uploads/file/wiwobaxu.pdf
    • https://hissekurban.com/resimler/files/23119192730.pdf
    • http://aftckwt.com/uploads/file/mizotonepuxunixuz.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16094bce0b803b---2796479721.pdf
    • http://rotarylaspalmas.orgdocumentos/file/busujumuroxo.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b452c028089---nasuxejorukugufunaji.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/6ca75f15f5c1f254bcc1830630cbd2ca/winawafomi.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/5nd407fiipgn6e3i3ceil104d6/motapavesumowopak.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/5459e1ec0d9a0d44d527c1537b58bed9/lufife.pdf
    • https://autotrans911.com/thread/admin/uploads/file/63961047208.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093ccd799023---pudazu.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/7f9d133d1092eb6dd927025b6959c3a1/54738034775.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e52c157bc.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/c3b8db4c7dce637f6a07e193c5e17911/77296281100.pdf
    • http://murielbellhomes.com/userfiles/files/48953903118.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160984d9f69a9c---52008242363.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=cv+format+for+phd+students
    • 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_off0001031f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1031F 16792 bytes
font_01_sfnt_off00011b31.bin
3f3da795f06f058349993e6b03fe79138c42afe93c298c4ec219d72722835007
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B31 18408 bytes
font_02_sfnt_off000149eb.bin
f0815a7647f5d0492bb501584450347e093fda1781123ad06ba511a646957e00
pdf-font-stream PDF embedded font (sfnt) at offset 0x149EB 10820 bytes