Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc3a9a5b02f0ff3…

MALICIOUS

PDF

106.4 KB Created: 2021-07-28 09:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4b8f3d13029de8f18f1eb1d7fa043598 SHA-1: 6a4ebec3fb525c011bf947d2f2dbe250616743e4 SHA-256: 7dc3a9a5b02f0ff34fecfbcee82c97ff37e3a11c5a8e480a34eacfd5c773f48b
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs point to a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607496aca6fad---xaxipogedaxajasuxikexafi.pdf In PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/fepaniwiguxinekukagipir.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/625o1rimv9naou3hdlquiidhsc/suxuguduwunaxegilutijid.pdfIn PDF document text
    • http://rghsalumni.com/clients/82979/File/nakisupilepijuzifo.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8e673279f---72566623299.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b2648b8c0---rizomisobexipu.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/63104651066.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cbaa7659d---bebabinagu.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/3002688997.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/90aa3a428210cba0204cab577981fd6a/vawixatusudojalak.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077a9a6a7944---bovufasuzipel.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/c038aba96700b3253cc33ddf9d2cb0fc/2205142695.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/1bed7bafc1eab1738d39b66fc7f415ff/mazumoxewakogev.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/pogariruxaxanixowovol.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/9003551620e4d14dac6ddd8211bed184/gixefufi.pdfIn PDF document text
    • https://ksuskalology.com/images/file/13418118745.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c309220b52---xapetewapizaz.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/46320411786.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607922a1629ee---turonakubinusoxodudota.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/35184171530.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16221054372706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=download+naruto+shippuden+ultimate+ninja+storm+4+apk+v1.3+modPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13298 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AAA 21120 bytes
SHA-256: df9a5713a8e7704bef79a78f57d771709e76210b357e37d563361b04b1926738
font_02_sfnt_off0001802a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1802A 11500 bytes
SHA-256: d8b2d060d472650792054d170f8d96fbe6eb35615300b5781878e263abe0fb09

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