Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2e99bdc8911b12a…

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 23:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eba0b04209b1bde81ed8978038a3090a SHA-1: 94cdef2144f52305035cbefd19545aa87e757e76 SHA-256: e2e99bdc8911b12ad65d4d210303dbb9659d8888099bf5cdcccf831a8920fb38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or lead them to further malicious content. The file's structure and URL distribution suggest it's designed to exploit SEO vulnerabilities or act as a link farm for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9f69551b9---sapozerapuvuragofiwekiju.pdf In PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/e9c829852dfe3a4e03f1323fe8c07e83/witijukejokiveduwib.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc701d093e---47386864780.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/wefadelojavedajagoru.pdfIn PDF document text
    • http://teknis.it/userfiles/files/7487198496.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/41943196707.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c89685249af---51658611480.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/26307897972.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/51167552925.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/vesog.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/37666084638.pdfIn PDF document text
    • http://allycatering.com/userfiles/24592314528.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/wiviwarobizux.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/fc6fb64ff0ec0e6fbdf772ddffb73cf3/72472502583.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/23944949819.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/jajenuxebeveke.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/5464332394.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/77971440283.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b99cec24a9---xekimetuguzojiviletop.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/36632502541.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/42655030875.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102cd7ed2975---55834062795.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c663ccac8e---repeviged.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/padobo.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/27593374837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=beyond+the+sea+chords+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_off0000cc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6D 10748 bytes
SHA-256: eb79403c32f6d2aaab9249ac3de71d9a58be6d4253c56c30d94600f9ce4be989
font_01_sfnt_off0000e523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE523 17780 bytes
SHA-256: b5e4a044e33815d8f7c1679bbca115e41b4f3d8a972bccbfed6b6857823ad171
font_02_sfnt_off000113bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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