Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b865920917d0908…

MALICIOUS

PDF

300.6 KB Created: 2021-08-22 01:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5c6bcc594d180894ec8c61711419b52e SHA-1: d587b5fcff4ec155fb83fce366f4d8c767bd43aa SHA-256: 8b865920917d0908a9a2157fb3cfcdaad11b329ded8f901b51bc1eb1685e9063
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded links, many of which point to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The primary attack pattern involves luring users to these compromised sites via embedded links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9801

Heuristics 5

  • 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.
  • 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://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/c69a5f1a8d679594a495d744af170ae4/70287364379.pdf In PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/2c09d86519cbe72495df97a7e3d66dfc/sorife.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/zaxarijafifuwetogovizeki.pdfIn PDF document text
    • https://o-dance.com/upload/files/sanuxapifal.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/belupoxarulolik.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/81343618121.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/87ca7e7455e6e55186874a313f5c2099/28253583423.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/luniragevomedakuladegemip.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b27528b9d---memexilovasuxonojowi.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c541ea9cbb0---20896349782.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/ae0dcab443c4a737f3a19664dc18c298/44727191593.pdfIn PDF document text
    • http://whitebearlakeclassof1970.com/clients/0/05/05755deafc47004aae723e515cf08a6f/File/24662394929.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210710_193637.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/77102634426.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/5806540529.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/88413971042.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e7efd906e3---53488587498.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/249be0a70ad193ab83400d26d0b2a29c/26426911127.pdfIn PDF document text
    • http://reichspfarrer.sk/file/86315805805.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/64375671341.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/sinimupanolin.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/22962213083.pdfIn PDF document text
    • https://gangnampools.com/contents//files/gebevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=q+skills+for+success+reading+and+writing+5+answer+key+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_off00043f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x43F3F 11380 bytes
SHA-256: 62a6b7250f46c279101c47322ac9b2c38174b34d58f3ae05060c5143227f093b
font_01_sfnt_off00045a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45A31 18560 bytes
SHA-256: 0a242d8dac8be4ac5356da607670614fa1b7058894065d99bd2e9c0e03357ecd
font_02_sfnt_off00048b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48B2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1