Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e8c9bb0325da609…

MALICIOUS

PDF

73.6 KB Created: 2021-09-26 09:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1460cf43ce3a4d734c1a3889421e15fc SHA-1: 37dfc7f6ccf4cfbc80ca68a0ff364afc2639aea3 SHA-256: 7e8c9bb0325da609d1ac91c69d279ab4a87e7e20a5386662c4adfcd994fd7c9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://laborke.ru/uplcv?utm_term=new+super+mario+brothers+rom PDF link annotation
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f874bdd35c---15807196611.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b605e3b5e4---xilomibalarereroroxo.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134219445479---24128346518.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614373db5f99a---duzafax.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/jarapovenufobabo.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/92540754080.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/19339983100.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f212f55d6a---44903426755.pdfIn PDF document text
    • http://garderoba.sk/images/_file/bokupemavu.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/tisag.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/62681885750.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/d352fce2e1c8cebb8080ff328b6b21a1/gemusolivoxixifa.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/fipuruxexalepof.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/fonisufibulupilobevi.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/27802400015.pdfIn PDF document text
    • http://www.moyekolodin.com/files/papifosa.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/netosap.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210920_130240.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16145e45b1c2ed---68909051581.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/15256875460.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/15571216021.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/11749068206.pdfIn PDF document text
    • 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_off0000b863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB863 18244 bytes
SHA-256: 9fa1c3a6b22c837a511ce800f100ab10910f9c3ce315e0d4961fd1a4a217360c
font_01_sfnt_off0000e824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE824 10672 bytes
SHA-256: a7926aa43bd6d28d397945d212a06ac52b8d1fc16ca330febba1f7fe252ff080
font_02_sfnt_off0001007a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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