Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4c4d8ea7439fa4…

MALICIOUS

PDF

89.1 KB Created: 2021-09-08 15:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 13c2b1bf6976e21a93712e1eefaa2248 SHA-1: bd2e369e5319475f2da96d71cf949555649ea92f SHA-256: 6c4c4d8ea7439fa48ef11150dd9b3c8c139488bae909d967badf72536cc592b1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating random and compromised CMS upload links. The PDF contains a large number of external links, many pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of numerous external links implies an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://quangphong.vn/uploads/image/files/63634922582.pdf In PDF document text
    • http://familie-schiecke.de/images/file/99289028814.pdfIn PDF document text
    • http://nanopena.cz/upload/file/gamoresiripakadara.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/df37b67ec4566eeafb53df909ea87153/7779558817.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/49108474115.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/jipumevokuxugapavobonabi.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/10669625253.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/tinemarerofomeg.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/40879568102.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/69531851619.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/63320979571.pdfIn PDF document text
    • http://gorillatheory.com/admin/upload/file/40554386817.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/91766274386.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/1207353318.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132517a3d767---robil.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/bo5pnbj7bvccdgv2an7p88pud2/jojojix.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/87904459956.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/figilemevubolavababi.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/15127904009.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/bukifesunoxudutut.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/nigufufeg.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378d809b905---13804475945.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/95482328085.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/73939362024.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/17299002905.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/50039972633.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=books+to+read+during+pregnancy+for+intelligent+baby+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_off0000f5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E03 11292 bytes
SHA-256: 9223df137e7fae4550762211df160a4144894156faeb487ea25b12dee0b46af3
font_02_sfnt_off0001284b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284B 17564 bytes
SHA-256: 5db56e1d1873bb8af9709aee986d40fb3e9d90b179dd2c134020e58de68ad0a4

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