Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ffe956578afd60…

MALICIOUS

PDF

85.8 KB Created: 2021-09-08 23:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4cc324e79467c9fb52c6f9c2100928dd SHA-1: 25b505ed64a66129ab1b932f94e2027ff339f4fb SHA-256: 78ffe956578afd60925282fe23e813ab49d74bd5a2a3df92a83c1aaa6dd29952
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable, but the presence of numerous external links strongly suggests a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://vattuxaydunghl.com/userfiles/file/vanagigoluwebosugiruxol.pdf In PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/64885317418.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/e25a6e9a25d2f1806408d7f0300d62c1/65057143112.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/48598026158.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/k676c2g198ksv8ndl1ua647e80/83216894514.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/70680277619.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/rvapl6rbmn8e85nh7tfcvpq8b5/zapogoredojoropid.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/wonuselematezisimugifa.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/36582486981.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/didibepuputulipaxilurowe.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136ea0957d79---54200848732.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/87057798199.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/42414644234.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/wumosejubixabebimovut.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/puwaj.pdfIn PDF document text
    • https://steammining.com/userfiles/file/36654251974.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/nevafubonodirabowis.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/31680241769.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/17317898541.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/dexenajojabegenupaworon.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/fusatuxutiwanos.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/87965533363.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/78591990863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+android+emulator+for+pcPDF 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_off0000eca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA5 16996 bytes
SHA-256: 90b53f883a5e8bd60e417fad7b9077228e6f4b7902d78ad45728629570718c57
font_01_sfnt_off00011833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11833 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001304a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304A 10976 bytes
SHA-256: 54b0792e57d8566303a90422834e0b1910c18bc91433976443553aee51c214eb

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