Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6a081fe5f0142f…

MALICIOUS

PDF

78.8 KB Created: 2021-09-08 03:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d68d73db63d0b02595ccc5b4f2c94db SHA-1: 28f954a1d66e981e9aefad08c9773bf006067c78 SHA-256: 3b6a081fe5f0142fc0b3b8e979d3d87b7d1237449e845cf5ba3810df27e84e2d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, suggesting it's part of a phishing or malware distribution scheme. The presence of numerous links on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://jshtextile.com/UserFiles/file///91185328422.pdf In PDF document text
    • https://www.agcontraincendios.es//ckfinder/userfiles/files/3626364449.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/8on0uraph0u780jq3j45b9vcj2/43985314299.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/b659678c72154c9d2245de83a47fc116/89287852747.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/33442121953.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/wesofakofiviju.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/wokewibeto.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/a62150c4d515534250ff60cacf657a7a/79153360859.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/bezofejarewotuvofu.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e39748655---volugu.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb008dad040---42201672533.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/wotoderoxatiraro.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/7o2hv8l2ktefmu68svq8oqk2cj/37874686477.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/83280272682.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/6e21d500ddfb8460d31cd96f2f74550e/7643135377.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/69056483448.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/gikekurusupewajavijon.pdfIn PDF document text
    • http://njf724.com/basefile/janatalnajafcom/files/kuxuni.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/95bdf83740cb18adbba64d0901e0b4c9/giniwizosa.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba529616439---39493241421.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070b4a983bef---kewibafu.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/ba0675926702c17992668fcef2126a97/jebevaxuwul.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/verosomadesogunufuvil.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106240426583020.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/36415211696.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/89988262489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=bimanual+palpation+parotidPDF 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_off0000d243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD243 10408 bytes
SHA-256: ed13452f13d5b2dee5875d7a8c30493a6a89e63230c1e57c82724ad35b39ecbd
font_01_sfnt_off0000e9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B9 16560 bytes
SHA-256: e07824f35053b30aeda57a53c023b240875a27b0ec61b8234271cfcb459ed115
font_02_sfnt_off000114df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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