Malicious PDF — malware analysis report

Static analysis result for SHA-256 87403620f5c07b17…

MALICIOUS

PDF

98.4 KB Created: 2021-08-25 01:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 641e61688d18edaba6b9904e1c06fe36 SHA-1: 28f0b0f4e7352ceefe3eb52a66288a7c4892e8d7 SHA-256: 87403620f5c07b173872bec9ca6dea087078689810813d4450d2cdb3495cdac6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://brianhaymore.com/images/e/file/pudatabal.pdf In PDF document text
    • https://atlaskvartir.ua/data/uploads/files/82053140677.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/584a971087e27b9ca3823abc304c9470/94303109348.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/wojizadeviberodonot.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/xedopegukexusik.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753816cc407---95119033693.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/dd3pevq94nkkni4cbjvti81jnt/rubenapibefawotuvoti.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/tadisoguj.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160865afab4b50---jasigulafulewixuzezab.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/zenara.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/26923525622.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/soganavud.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/17792554790.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/mafoginizidiku.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8e6e6e3a1---vodumozete.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021072011254267.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/fuzujenafabunanig.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc0f4a3501.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c724936e998---magolukaxij.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210610/2012425492.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/pesuwugovudujo.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/paxadonijupilu.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/1242726617.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=tilapia+fish+from+bangkok+was+firstly+introduced+inPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10139 11564 bytes
SHA-256: 667034c1fc7f70c1e815b9882562390e4efedf6c70808ab941ad54ed9076741d
font_01_sfnt_off00011c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1D 6792 bytes
SHA-256: 6d88a2901541f594e8e8c74db9583ded105d3c9041196292668aa8b1f7a34f03
font_02_sfnt_off000132f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B07 18304 bytes
SHA-256: c8f1bec3d4d86e6ea0b10296946bb2056469568d4f4ab4d6c4472b81797fc886

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