Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f4e70f7e8e3cbb…

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 22:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 826a578b84a07dd56efdafab0f9a0ac3 SHA-1: 34656f736231a1daca881d55597939d1ce2885bf SHA-256: 86f4e70f7e8e3cbbc60753bc81b6a0584d9ff34c9b5da2bbf209bedd736db977
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on disposable domains or compromised WordPress installations, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://demo755.webbazaar.com/uploads/kovologixude.pdf In PDF document text
    • https://volandovia.it/public/fileeditor/file/92856577801.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/newuxafatoxonap.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/51731181396.pdfIn PDF document text
    • http://ubest.ru/images/file/70911173655.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/70193733630.pdfIn PDF document text
    • http://royalgroup.at/tmp/fawunabujufodopi.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613909b340074---51914647554.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/bolomazaku.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613697c44a077---pefetunef.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/40475325959.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/37c5bfc97a9a2b084fb17d5d4d7878dd/mozajir.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c65aa8768ce3ed44e619a7fa7c2ec18a/14868972266.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b962cbda3---63734586481.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/3232094974.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/vakodolevetijalazegade.pdfIn PDF document text
    • https://ksboutlet.com/file/files/74536944579.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/bipipi.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/51489675472.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/65649555715.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/ribemita.pdfIn PDF document text
    • https://soechi.net/userfiles/file/nonadadaruwovezomewezobar.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/wevikuz.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/99428320048.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/sorugakimizoden.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/7675957312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=app+drawer+apk+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_off0000b1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DC 16212 bytes
SHA-256: cf87a13428b45eac064585b505fedb5fb0d69bb160fa9e2e396d0a74169966dc
font_02_sfnt_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 10184 bytes
SHA-256: e7b07c2c087545dd4cd65f2b7704159cbe37a938914ba36a2131de5c5f2cfb5b

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