Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdde0c1c97a1fa72…

MALICIOUS

PDF

83.1 KB Created: 2021-07-31 03:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ec987e3f1f0b496c188e127d3526e223 SHA-1: c5baa5f23c88c957b0ff92a2720fb8fcb835552e SHA-256: cdde0c1c97a1fa72ae5116d61a599e76af6f92bf8b255c0fb87c9da93e8fbe3e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. It also features numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download or redirection to a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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.
  • 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 https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/c0af401d57c9c09e8011c46c18d4fdc9/waladuzalowosajunu.pdf In PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/q0t59p76dggvqsnuf574jtj4i8/mevag.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/8553c169085690b0f675eadd970e7a27/nigewone.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082474ebbebe---gawafabowigerapenabopukij.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/37343516479.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/97080052242.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/dopejusamim.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/c21cb25f3e431881ca70aab07e768b6c/97412377774.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/50207562492.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/2116318c31239398f7dfa6a54b39b2b5/kuxaxax.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/tuxojafigolepedadaza.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/39982233519.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a910d7c83ec---19289743581.pdfIn PDF document text
    • https://projetovm.com/uploads/files/botepafulapituxuduromit.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608296827abf6---97948749017.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/a6849bdb9f59b2a710ae3ff119dcf84f/dodugedusodojof.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/lirarebokuvufudo.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abe56a45c23---25597473242.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/31082821588.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/24941038225.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/1920922592.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093c3240d8a4---getepunexusimapapeseb.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085205cb2eb1---52584966351.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/botimazidelud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=do+they+still+make+thomasville+furniturePDF 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_off0000e288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE288 10852 bytes
SHA-256: 3f08bc89b69e7689fcd5b4d89ef2ae89d0a4356b2e405be0a2dd17623609a5b9
font_01_sfnt_off0000fb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001138f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138F 16224 bytes
SHA-256: dbcda5e16423755ec9f459290df7e0994a9baa57b3cf6f08230eddb2a0de6780

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