Malicious PDF — malware analysis report

Static analysis result for SHA-256 58288506bc43ab9b…

MALICIOUS

PDF

80.7 KB Created: 2021-09-02 06:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 166842ee2845764da22f205209366b15 SHA-1: ad80229ac5ba6e636897085f71b7963df12629e4 SHA-256: 58288506bc43ab9b14e991322585c8c7374fd6f70e6bddd4a3bd5f8b64098c3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://synerhu.ru/uplcv?utm_term=soft+vocaloid+songs PDF link annotation
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607118ee2a694---laturumalowipak.pdfIn PDF document text
    • http://modern-pro.ru/files/file/71238229401.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/zogakogekitano.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/jepudoduxipugusomiduje.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbb20884d6---30785279855.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/kk19d73h3ti5cpumofmrm0e7te/5996728794.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/kipetope.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/kubefawikuzezigefudoba.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/51737505111.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160806a2c18639---refenuxinilitezugowuj.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/61818436786.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/ponenipuwalekonanavonaru.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/46cbac9a47f99b0d0279bd2efbfae2f1/pajiwerologo.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c71b69b0c---77581377486.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/cc854rh6sibbbaf59m0avnm4g6/jinewabokul.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/91605531123.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/20373694991.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/81028141803.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1608f571eea3c4---nufuzorigijuluwukisimi.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/22904642001.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/xuvekunifut.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/gefugarimeganezu.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/molalovatak.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_off0000d098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD098 10560 bytes
SHA-256: 8cdf1e707c05a93fd9d80cb8b6379521f2f9589189d3d8c52716ad691ed447d4
font_01_sfnt_off0000e896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE896 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A8 19684 bytes
SHA-256: 2064f37e11656a9f7e8401636176220afdd74b3493eff580e778c825f7e16fee

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