Malicious PDF — malware analysis report

Static analysis result for SHA-256 136d716d781cb588…

MALICIOUS

PDF

82.1 KB Created: 2021-09-23 09:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 44f4931893c90a65010254c8cad0f7ab SHA-1: 9a8eccbb49b0066b93df6c5e61e27a1c4e356046 SHA-256: 136d716d781cb588d8a4adc6a2acfdbbefca42ac7fe2d85fed7dda5406ae6d4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://filippodelvita.com/demo/userfiles/file/15410128853.pdf In PDF document text
    • http://problemconsulting.com/img/download/files/81397790041.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/tuzaxekenejekifed.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a6b000ffe84b82a98eaaf4afdfc1d106/79780061023.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/34995951013.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/suwisijakiku.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613743ba5b6e0---jutebanijepitaw.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/xeguj.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/zurolekasebafanizusifutux.pdfIn PDF document text
    • http://licausi.it/userfiles/files/51514487024.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16136144408eb1---wixewuna.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/6997269146.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/xesawebapufoduw.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/lidukebudibol.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210909223048.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/31030959900.pdfIn PDF document text
    • https://medius.sk/userfiles/file/91231365361.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/xupepekidiwozariri.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/vukedog.pdfIn PDF document text
    • http://jinyezi.cn/upload/nuvibidikeliveduzuzob.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/34356627769.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/zuvibodatavuloz.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/xofaduxamu.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/091906387391.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/dikit.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/43424160721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=magical+voice+changer+appPDF 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_off0000d837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD837 10444 bytes
SHA-256: 8dab4bacf5061a5692b05f2f6e4a5fcd2cd81a4f963c86a4fac5c7e51324ac93
font_01_sfnt_off0000efd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E8 18996 bytes
SHA-256: 66fd435ce8db03865788f48154714171c89da0286045fcead280e4fe507cbb96

Open this report in the interactive analyzer, or submit your own file for analysis.