Malicious PDF — malware analysis report

Static analysis result for SHA-256 48d7155cef771c19…

MALICIOUS

PDF

82.2 KB Created: 2021-09-08 20:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f732bd981bbb4d8ed60053e745aa0b00 SHA-1: 7f6fc7ced92173a04856e72614f2e905daf7d428 SHA-256: 48d7155cef771c19625e8d5a448f50be84f4a3373dfd864735bc174377dc817c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by a ClamAV signature and an ML classifier, indicating it's a Pdf.Phishing.Trojan. Heuristic analysis reveals it functions as a link farm, with many embedded URLs pointing to potentially compromised websites. Some of these URLs are hosted on known compromised CMS upload directories, increasing the likelihood of phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://genegurumiraclehealer.com/userfiles/file/95667021803.pdf In PDF document text
    • http://afro-safari.com/upload/files/33471008647.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133030d6d517---54776345242.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/73885255084.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/bexokenaronibakanezaribi.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/56933115154.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/94446275686.pdfIn PDF document text
    • http://vititanon.com/user_img/files/gowogovoxuviza.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/555166195.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/28185338166.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613363dc53f50---10437568242.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/tewafusafunudadetiboti.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/ritejimuzepepukojovipij.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/xizozalekixugelulobu.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/sabuxux.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/zevadim.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/5452312766.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e6481593a---jizibinidurizijajoso.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/suvowax.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/demikelufamovibawekemufov.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/38556159285.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210902111636_mnuzkd.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/sapabavagirulolil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=cardinal+watches+instruction+manualsPDF 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_off0000d5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD3 20028 bytes
SHA-256: f04edc787f73834a846edc36b9368aa8b8a079315e47b8ae9b5c1d677731c8a6
font_02_sfnt_off00012262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12262 10852 bytes
SHA-256: 991dc5cba4a6490c292b0848a31010cd4c247098d9c58a05e9bb0a673673e14e