Malicious PDF — malware analysis report

Static analysis result for SHA-256 788c40ef6f00d3b2…

MALICIOUS

PDF

86.8 KB Created: 2021-07-18 22:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 69712ad49519abb1f12b9d4cdd8e64a5 SHA-1: 1f016a7b7ea4f53d98d91205d7d734e2bb53eee5 SHA-256: 788c40ef6f00d3b2d56ca46a25972b7d4590b692ae715ea800935590090d0bbf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with high confidence. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggest a link farm designed to redirect users to malicious sites, likely for phishing or further malware delivery. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using numerous distinct hosts for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://accessiblevehicleservices.com/userfiles/file/mugukokino.pdf In PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/a51hgc8mqe1fn9bk5j28kpul1v/wajofaxizetenovebojula.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/lamofuwetimamusere.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/0f25dc14ca1af975881b70e994e67741/66324835190.pdfIn PDF document text
    • https://777mto.org/contents//files/diboxukujiwopejumi.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3004ab8bd2---kiwunedo.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/tlm4hi7u7nccr7ei4tgfj28pk4/vurovebaxisawafam.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db0ac9d270e---vemugudexawikojopiva.pdfIn PDF document text
    • http://furniture83.com/upload/files/netagib.pdfIn PDF document text
    • https://kultmotor.hu/images/files/66284153142.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/rejed.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/26192760691.pdfIn PDF document text
    • http://ibb-online.ru/f/file/11950115343.pdfIn PDF document text
    • http://chobacgiang.net/webroot/img/files/54354107644.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/86452158637.pdfIn PDF document text
    • https://plasy.com/uploads/file/59698803077.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/73747518640.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/3493469108.pdfIn PDF document text
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/88b95d8b0ca390fd41d35989fadba2fe/popubudugenitozo.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e7ad6de88---18934388067.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/11779391016.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87e1f0e005---78465277746.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/34b9ea9dccf89dcf6d0d107a617c4784/vamijemule.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/fab7e34dff3795bfde35fe08a76e3dfa/funurerufop.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/dadepaduvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=what+do+you+capitalize+in+to+whom+it+may+concernPDF 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_off0000ee1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001062c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062C 16884 bytes
SHA-256: d6e9fa139e30587883d8acc97721aff63a0155b51719bbadfa7254423a5e26e0
font_02_sfnt_off00013268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13268 10964 bytes
SHA-256: 2096858cc0b33f3e409cce785d405aa938ebfd43d855cc92a639d7a38356cd5a

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