Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e416b3f90d9a03d…

MALICIOUS

PDF

88.6 KB Created: 2021-07-19 20:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a815b4b69dfb441ab59f23f6dd206670 SHA-1: e33c2d96eeffc91a55ec48d4acb8d19de9c1bc4f SHA-256: 6e416b3f90d9a03db1b17cddd88231160fcad41c34d3d1b8cdbefcfe94fa5aed
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://a-daily.jp/app/webroot/contents_img/files/dewavupobamamaxukemixu.pdf In PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/oe1pgivgp6psnkm0fm19dkk131/62757738370.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/0b4313df0917915a23a4597d08a70d2b/82133321113.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/83097858887.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/28598603149.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/fiwajenajoxifi.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/24bbvdpbh6ightihg8piljuc7q/likisovenuk.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25f9e1cac7---nubezoxedidi.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/1oa5kgukl1m5cib5rgba6q3bo6/4076393237.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2926041a10---17832729053.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4528540cb0---fowojawagidurede.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/bcts5dfqsfem6oq7ff6bb3n9o6/medak.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/gedugisuvugotovavojupaki.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b062d183913---piboxofenitofamit.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2dfecebae---vepikeju.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/0a351cf847623f305a414601e2c59222/vosafasal.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/bf506a94a5c2b2af8ed4e0c7de6803ea/38689049577.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/e3t81if8p5erndeel8o4fpr3ck/16882721929.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/11d38dc1248e27b81f8c5e60d5869036/wujiz.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/17821801879.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4e2797c74---davufoviwizugel.pdfIn PDF document text
    • https://kuepancong.com/contents//files/ninitadatavixegaletoli.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/sovekefezam.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/liwuzulup.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ef0b3e321---36590270076.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/7571458d07d3ba83d9540a216a14d09d/39287244218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=clash+of+royale+private+server+downloadPDF 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_off0000f451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF451 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C63 18152 bytes
SHA-256: 9116921e2ab52222167f60676bd3bd6210ff1027e75aaffdbc5fdd03e8e4654a
font_02_sfnt_off00013b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8A 10892 bytes
SHA-256: a3f5d9e4f64c249bc157d07ae4d649344bdd987811278d27a0fdf9250607b27a

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