Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f708c40e8ffaf7…

MALICIOUS

PDF

70.7 KB Created: 2021-09-06 20:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 85e10bfbe9b30cbbe05bd8f0ce93c434 SHA-1: e934e72867f51bdd54176f0516aa24fc373e6601 SHA-256: d3f708c40e8ffaf764b42a71ae648ea3aa60f081fc14472d78398a265d5c075b
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 0.9973

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://learningkey.org/userfiles/31354841499.pdf In PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/e814ce4e374180b447a4ca924203d824/sunedugefu.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a66f3ffd8---31401475864.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/ebbed47f3079105a4ddc96d29c6c6ad2/83260725255.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/wuxinuvevegoveguziromitu.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/fegixazinaxogud.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b08a7713d---54628891661.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/35967425860.pdfIn PDF document text
    • https://aaaxxion.info/images/file/20165575919.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/kuxere.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/vaxamalizapewijepizixe.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/nanowixotibamebem.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/50692787590.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126b14d95c31---bosage.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/7133290880.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69e40876f0---tinigazuw.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/vefasefafuto.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/26bd094a3a45154ec107cad94ce826c0/lerelexiw.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/n9b9vgnhrnvfiqrf2d56ji7qk6/fofidis.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210507023535634.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16091c7d368c83---vazugif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=fluent+in+3+months+benny+lewis+pdf+free+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_off0000b15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15E 16172 bytes
SHA-256: 068acabf7eb5aa100cda005c96effbeff36b2de4d4d469ed83e01e8e02248bb2
font_01_sfnt_off0000da81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF298 11352 bytes
SHA-256: c968aea0ecfd72f0329c54f19a716102340c864d157e959d1ec1ce383ce20e30