Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e350813a96bb1cb…

MALICIOUS

PDF

83.4 KB Created: 2021-09-04 03:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f85e126237215ac7410beca979416aea SHA-1: 699a1094e80f665653b20efe681aa2a71b8ec6cf SHA-256: 8e350813a96bb1cb753bc0bd296035ab4c85eee93327a9df4473dfbef70801f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload directories, a common technique for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the link farm suggest this document is part of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://songhandiban.com/uploadfile/file/2021071611093973499.pdf In PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87dd68b5bf---fugelavo.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/nixetudojegubabelopotuxiv.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b99c87083a5---gobemozodukarogu.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/viperilinoxo.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/wesifodepikudomixutagam.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/89039383242.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/84417032065.pdfIn PDF document text
    • https://himanshikitchen.info/viking1/uploads/files/5679937819.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb379e42bd---48595445264.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/zabose.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/56439663639.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8cd1ca968---masepa.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/31ba64c7cbdd59bde1dec2f2a73812d6/ralitavusifewisezoxi.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160871d81e1610---fidigugusapobu.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/gowutidudenewama.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/xunukakego.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/f6afb3352627f5c1cac1e1644b2a1b82/99854488036.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/nilunugulevukexirobo.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/30885922279.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/mulufad.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/pidapajod.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a73787a27---6716982008.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b82ca0c84---goludubus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=manual+handling+course+cork+fasPDF 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_off0000debe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBE 10844 bytes
SHA-256: 8e6a9f4480ab36a38259e3baac1b78014b40e3ee41f627f050494cd541d42540
font_01_sfnt_off0000f771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF771 18308 bytes
SHA-256: 37582d337205870ca8931381e4e800d07add27a42239e0ac57e235b2331707ae
font_02_sfnt_off00012640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12640 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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