Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ffe853eab183ec6…

MALICIOUS

PDF

78.6 KB Created: 2021-06-30 04:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 48e1613ebcb144054ae35070b5d802cf SHA-1: bf9f341465da76446ccff59fbdf68d3ac22b1a21 SHA-256: 5ffe853eab183ec66e30540d95ec394e09209ae7cc1dd8f1970b33ed24631db2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

Heuristics 6

  • 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.
  • 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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/b97c7e009b9a70f412c9952f5ef047e4/75073821694.pdf In PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/712d78a8c6097d72d16b214057b9d2ed/mezofofazo.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e3108fc09---47202948891.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/01bc3e1d7eac2d695089776f2349e4e6/69592142325.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/pelukusidi.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075829749068---mewix.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/6081bc5aa5e463accb531ff873f0e5b4/98359487525.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/bojovimusibipijeb.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/88enp63c10lr0a4djl5sul6op3/51937468065.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/xokunilulijexe.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/jelabejumimemakupuba.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/400a2d417f31ede1ac1cf1d6460b147c/mawutapofe.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/reluxudoradidafiwo.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/96284773511.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f3d003fcc---55947888109.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/wulitifipepuf.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8db1bee091---xipijodadara.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/jujovife.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/048fe3bbb69c2ecba2ab3ac07476a555/sunitipitev.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/0684f07f1de12e15a92ff164e8254451/1352424817.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/36108112154.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b376ee63a6---51259657912.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/49db65ce34ba642a2631e9f76fd503e4/novofijevuvez.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e699e0348---73255670831.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160788a457f278---pinotewepujuwuxogeruj.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0d2d6f4dd---tugefoxopasoraligobud.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/bapumakegaroriretejiposa.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/jomolusazisatenizizumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=examples+of+business+proposals+pdfPDF 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_off0000d26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26B 16104 bytes
SHA-256: 0804fc071a106b995a5aecf800ea243ce3e287cf0997099c3b57d0df252ffc2d
font_01_sfnt_off0000fbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F7 10888 bytes
SHA-256: 637c19c63064646f23e31aea0eca53dc0aec0218a10fcd755a86727bd9def575

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