Malicious PDF — malware analysis report

Static analysis result for SHA-256 76417fd42d079979…

MALICIOUS

PDF

98.2 KB Created: 2021-09-04 01:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4e9377ada59ea657ea51aadd5fb46e1c SHA-1: caf4ded0d11da3b0e768a761f2a54455df9790c7 SHA-256: 76417fd42d0799794d793df94f575f3ea06c1373b37bc3ad1d0e13bc86a1f2d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://shengnabei.com/uploadfile/file///2021070115363750.pdf In PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/lijewavalosatasonazuruw.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/litoxixerofaxefesosulofu.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/rafoje.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/77034302688.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/67665617756.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/lulesesor.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/7985233973.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/wifisijibatuvedugusamawim.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/mavepunezuladede.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/43792364884.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160762f386cbbf---7511128909.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f5e679d13e46f0f74d5380a2793851cd/14744712566.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a420c78833---41963560122.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/jovutowole.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8fe4cbed7---ruxat.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/1a8c0d6f47c374ab18a26aa527691030/vidolalebev.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712d8c512fb---liwigosejadajujebexuwotup.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/d1c4eb39a91c13735df7fe4fb2b3726a/66812193595.pdfIn PDF document text
    • http://szwygs.com/upload/54942756490.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/73ce18ef309f720ca933b60c9428e0c3/31027180954.pdfIn PDF document text
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/zujawiseb.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/27497051397.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f93f3e5c1---43373382993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=financial+accounting+and+management+notes+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_off00011618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11618 19852 bytes
SHA-256: 6eb7919e8159b96b06cfb9378d9313d78a8799be02e7be02b20961278e27f204
font_01_sfnt_off0001496c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1496C 10940 bytes
SHA-256: 2c8ca61d063483f6ed56839c44b683e3126d4c60bc216b00b5da24127e8aa1d5
font_02_sfnt_off0001628e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1628E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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