Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa12577c6c4c6f0…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 21:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b206245dfc2d67f6fe40b38eed5a8efc SHA-1: 68e4af6088524b565b43dac3821e65879228239e SHA-256: faa12577c6c4c6f04507af98d673ab3d4de25f67070360e115528bcbae596ed9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and employs a social-engineering lure to prompt the user to install a browser extension or update. While no scripts were directly extracted, the presence of embedded URLs and the nature of the lure suggest an attempt to download and execute a second-stage payload, likely involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://next-engineering.com/userfiles/files/nedew.pdf In PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/tuzefugavifekisobul.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/jibofalunej.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/62022272436.pdfIn PDF document text
    • https://polaria.cz/images/file/92124707233.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/wibivofo.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/30948368946.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/binitujoperotiwiweni.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/kipigeda.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/fojebuxirabotez.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161438b1955529---59978595126.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/xuzejutorukefasutozag.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/3b9d916b0e9ea049fc3ef17dff64c77e/94268853302.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/31446151611.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130c12f1eab9---18090360942.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/gavadepa.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/89853769103.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/44070226126.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/rovifopomek.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/89789142219.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139cb4b5210d---mejalabagazunaloxozalafa.pdfIn PDF document text
    • http://seto.cz/uploads/palafomakikewaza.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/28771424714.pdfIn PDF document text
    • http://tcihk.com/userfiles/24555173793.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1631697169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+see+how+often+someone+looks+at+your+instagramPDF 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_off0000e23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23D 17240 bytes
SHA-256: 1774eef1f3a0fde410c7f5f16dd355b0de931ebbea302d459b348fe13b50901f
font_01_sfnt_off00010e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001265e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265E 11044 bytes
SHA-256: 846155083c1752e4ef8fdff5eb94e6009f72a38c9613196d0c43b263bf68ab79

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