Malicious PDF — malware analysis report

Static analysis result for SHA-256 d92ea68e48255338…

MALICIOUS

PDF

72.9 KB Created: 2021-07-02 05:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97eeaaf4e3bc800cf747f5858f5f7284 SHA-1: 1aa85bf5bf9d6f1cd0322f2738fff41a8b492f3b SHA-256: d92ea68e482553380216adeb6d00ce4eee7c445ad1e4a10aa30d49a249737b6d
156 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting, forming a link farm. The PDF structure and embedded content suggest it is designed to redirect users to these malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.oiseaubleu-promo.fr/userfiles/file/junobavipa.pdf
    • http://easyreturn.store/userfiles/file/85429387383.pdf
    • http://adabaskimerkezi.com/upload/file/xumarelitavenilapo.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6fd41c04a---tijosanenerodare.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aff19ab9244---fuzolerasaxito.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a793d3895---sesovomariwuben.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/310b6d863782d3ce5c21927f49a9560c/7077952865.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bb8fa158d---gezogatotupusezuga.pdf
    • https://greenfuturevietnam.com/Upload/files/xegozoz.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/hd66k51cqjpfdb118bun81mtr2/vobujakirogazozedivib.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ef556c171---vurabu.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/26113594872.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083393eef112---tadizitavajofuvuki.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca8b5742a---sopowisubajukanalewulobak.pdf
    • http://ahxxzx.com/userfiles/202105/file/46216192149.pdf
    • http://morethancars.nl/uploads/edytor/file/54377594023.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bda24b542b---solujadovu.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/55ef6051256705031cb171c3e5de2192/rasikopizugaz.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/ebji2srphtb33g56qrt0j5o0i4/zowuk.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/i56nnqesna60fk82eo982iot0o/zoxojutexapixevuziwut.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/v4c4lmorskfpfvmqlsp40r3nht/lufolotiwipokanukobabala.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=content+in+kannada
    • 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_off0000beef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEF 16792 bytes
font_01_sfnt_off0000d706.bin
ccd29df794b14611b2c0027390bf0bf007eb0b68c53e66d4d9ea4fd1a8d77c79
pdf-font-stream PDF embedded font (sfnt) at offset 0xD706 10048 bytes
font_02_sfnt_off0000ed85.bin
9992bc51cc8474da29686529d9a92a3f42ce9eaac0ce7045d3d4317665ba8058
pdf-font-stream PDF embedded font (sfnt) at offset 0xED85 16060 bytes