Malicious PDF — malware analysis report

Static analysis result for SHA-256 a598025b873ddfd7…

MALICIOUS

PDF

76.1 KB Created: 2021-09-05 23:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b9c9f9484d5f52b3ce32b82665c20a5 SHA-1: f307aea9d6aa33ceced71c9da0d449ea981033bb SHA-256: a598025b873ddfd7f66f2cf24286a7f32ff92ac8ab8730d85273f4fb2ebf1221
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains heuristics indicating it's a fake invoice or payment lure, directing users to external links. Several URLs point to compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/eu39muotu2jnpbtbvrp3jeivn4/64141831933.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607033d4bab69---38807288130.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160891ca1ee02c---vabojawon.pdf
    • https://tort-art.ru/userfiles/file/tasuxokupemamojuxunutoso.pdf
    • http://stensoproject.com/userfiles/files/58141224317.pdf
    • https://redac.ch/upload/26708644250.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/161071db831b3d---luxupipusaxa.pdf
    • http://sun-green.nl/ckfinder/userfiles/files/51719558690.pdf
    • https://officialbacknumber.com/editor_up/80456986741.pdf
    • http://kcobafl.org/ckfinder/userfiles/files/xilamovimopagev.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/86373761261.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8edf85a7c---79799133897.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a569875d62---20561078035.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c212c4ccf---22992737301.pdf
    • https://denizlihorozu.com/resimler/files/fusuleniwu.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b305be10798---dedoweba.pdf
    • http://homeopathyhongkong.cn/files/38489775227.pdf
    • https://ferdavagnar.is/images/fck/file/14197279389.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/6kg99lrbiq8cjfn9s14tq2hb4j/39699943417.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0587480d63---54412165551.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/97c2f95d97a704e6be2a413ade259bb2/zikaxowatexaje.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c566c482933---40869220625.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cffceb65138---gofob.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=debt+snowball+worksheet+dave+ramsey
    • 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_off0000c493.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC493 16792 bytes
font_01_sfnt_off0000dcaa.bin
57e594a6d0a43ac8f468c8bda2ee80dc823c51e5787a272a61640f6392f6f4f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAA 10920 bytes
font_02_sfnt_off0000f5e5.bin
94d5e85f3a7d7777dedb0ae56c1521748785301845c141d33a35d2b2aa3cf933
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E5 17288 bytes