Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5b5b6ebae4c340…

MALICIOUS

PDF

79.9 KB Created: 2021-09-05 15:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 53691ceb6f9707e480045c79136a814c SHA-1: 04afe7251b8bb838c2d3b0353fe1a37df5efa012 SHA-256: 3d5b5b6ebae4c340d77f2c8cd613c2187078190cf2a69766fafd1104e2129e37
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of a 'download button' heuristic further supports the lure aspect of the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/6476f375fbac98d9cc652ea5a5b6c3b9/likepanezosesokatamodor.pdf In PDF document text
    • http://verypool.cn/images/upload/File/somusobavelizidok.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/n0jt2ucv04jg8hab303hg2aid6/gumonawiwozowokuza.pdfIn PDF document text
    • http://gdgom.com/upload/file/210629144724607379ujyeggu076zv.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/zekelifobadiviravapalet.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/gefexodojebamevidem.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/66873198738.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/25884049370.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca461a893a---gegisuwamawopiduzuwo.pdfIn PDF document text
    • http://sanmarinreunion.com/clients/c/c0/c0747301521b2fcd71a0106c9132c7e7/File/17045496261.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/fukasefalo.pdfIn PDF document text
    • http://peak-experience-japan.com/36574862253.pdfIn PDF document text
    • http://mousike.it/img_ins/files/wipuvonukonozuzezafaditi.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/73062a84f7784db22a12778cd0e32f12/fupamapesufumolenugolir.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/4e5f70493ec1e67415e52a863b8110e7/zivujebiwaweporedaj.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/mnhe49fg2o20rhvclsaagcd1n2/78589034216.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/qq5a8tlkaviuc9mvc2fu44ut36/77001676823.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/zaxupakuvilup.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/20474184405.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/wigurugifelop.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160757604abbee---duvejugopagaxuno.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/rajarapozexafasogup.pdfIn PDF document text
    • https://chptravel.ir/data/file/77356330915.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/35a3041b2c06100018c14b958a246513/rutujif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=upsc+ias+prelims+question+paper+2014+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_off0000d067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87E 11404 bytes
SHA-256: b67796a2a0bcb82b1cd3cf802c1aeeb0ff687bacbcb2412153c0b8f9bcf4ea15
font_02_sfnt_off00010347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10347 17976 bytes
SHA-256: 671476da640e8cbb9c0838479e7e4639e0b7989e32a5ce5e2b4f8c119b8df225