Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b4875616137f6a…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 18:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5d226712f1719d3d8f811205169149cd SHA-1: f32ec0bd0a6735d201a2753912e6ba6615141247 SHA-256: 39b4875616137f6a965dcb2c66a9b043f1c272091b481a5f89bd408388384d0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm for SEO poisoning or to distribute further malware. While no scripts were directly extracted, the nature of the links and the detection indicate a malicious intent to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/cqvvn257pkv198bif90a42v64a/gadomukagizupijezot.pdf In PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/wederikuro.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/xixukoxawurotetaxodomor.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/e82afd266e230723018445689bbe05a9/tejodigedajare.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/latalugibow.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/202192115839776.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366acf4828b---tefagik.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/datamodakidonigirupipoweb.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/wokojadow.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/vulikesezazap.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0ee905d4c---1545988088.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/12130950172.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/rajonatafubi.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/16428399699.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/62832698809.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210909_718463AA4CA5E58A.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/peninut.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/54739938436.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/57609776514.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/keborodotovirukef.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109030612331526.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/wabuzivalizutevoxezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=master+for+minecraft+pe+mod+apkPDF 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_off0000d58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58B 17792 bytes
SHA-256: 9e46d1eb51fca214f9e66fb9a846a788f1b20ba5e09e84c890ef25c7d82327ac
font_01_sfnt_off0001037e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037E 10820 bytes
SHA-256: aadc4a9788062647c013ec1a761a5e72af23a4a5987adbc3e85cf926f0ff386c
font_02_sfnt_off00011c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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