Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c54630107598291…

MALICIOUS

PDF

93.9 KB Created: 2021-07-19 19:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ae08885472e2b952c35fb6504bf195b2 SHA-1: 85d59c622d4d96166e05439597099ffe636142ea SHA-256: 8c546301075982919385dc4fcadbc4fae3dbe1a3e71a68a4ddc06e5a16fafefe
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.nomorcantikjoss.com/file/nupeworesom.pdf In PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/04b2f3e91bd4ade2f8e013072e9d090c/gufawufemaredebakovesen.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/34059934426.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/tukefamepoli.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/zulufevirojin.pdfIn PDF document text
    • http://merwepizza.com/upload/file/tugovegijisilebekalajox.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915a6165c4a---47520940083.pdfIn PDF document text
    • http://butterfly-propertymanagement.com/userfiles/file/39860867946.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zezedap.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772388f286b---70694297625.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/910c8039e79a4fb0cb773fc40eed8269/kerifolepofasenuk.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/mevimapujelemisajisabet.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/71521085755.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb090a29af---vofuravitarumu.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c159869a2a7---fozosasezotuxa.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606dff45d442d---36249347549.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/fanenesagijezapo.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/1064613307b80e6114fca47724abd529/13243874206.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dda4aee4bc---fejurirofemo.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4c3aeffbb---mutilemigel.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/q3iofoprkm00f2r8ses7hng9l2/14249848739.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609083537de56---52525942269.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/ad30d4ce0b0e5a32150e67481e723e7f/60956210626.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64d7c0c60b---37644868914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+quote+a+jobPDF 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_off00010c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001244f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244F 10184 bytes
SHA-256: 0391f65f5ffd040b36e0de15cc8d63736af781c683fd333c1d4d4de00cf61c77
font_02_sfnt_off00013b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B40 18052 bytes
SHA-256: 8ae5396241a09e93e675f49044f8d896f3a10c26fef5e8a8369978cfb5c0189e

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