Malicious PDF — malware analysis report

Static analysis result for SHA-256 01082843cf86f69b…

MALICIOUS

PDF

72.2 KB Created: 2021-09-14 04:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2d91acbf16641e9b8dcd6e8a351245e0 SHA-1: 7e483ca357191055117432c95541def28378032a SHA-256: 01082843cf86f69b575e5579fe9c1bc10fb9968fd1c8cd577155f2d2b7dd3a20
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to external sites, many of which are hosted on compromised WordPress installations or disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://wastran.ru/uplcv?utm_term=sound+word+o PDF link annotation
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139cc998bde8---gakodofede.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/97570659449.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/33355967081.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/manivabuwelobexun.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/29583881167.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/73599156772.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b94131c21a---28717095666.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/98465438043.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/50306094214.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/91645722589.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/lonoboririfejoviporow.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/11554078737.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/47916326611.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/fevumevuroxubazita.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/16376245349.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/75996592365.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/5989289315.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/pisabexujaxivulobate.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326ebd651af---81547483809.pdfIn PDF document text
    • http://bptramptour.pl/files/file/kilirenipefogamiz.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/ditoritotej.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/27480119598.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/80406459959.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/53118503866.pdfIn PDF document text
    • 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_off0000b7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F9 17732 bytes
SHA-256: dadaf2a80f07691705b95ce0647295ba3df78310382400bdab401ccbaf2f69d5
font_01_sfnt_off0000e5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D1 9804 bytes
SHA-256: 9f372f0c66d12f6daf5f40aae342fea80d4ce5de35e5c0080793d3fda9537a27
font_02_sfnt_off0000fb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1