Malicious PDF — malware analysis report

Static analysis result for SHA-256 968c038c879dc364…

MALICIOUS

PDF

84.7 KB Created: 2021-09-16 10:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ef43b2c407fce33d8338e1960f420cb9 SHA-1: 6350482bfedd95f5a628185c54d11194af5f3645 SHA-256: 968c038c879dc3647a47924ecb9c62f3455190772176fbe73693961d6a0c62fa
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains multiple links to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure itself does not contain readable content, but the heuristics and URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://ansatrans.ru/admin/ckfinder/userfiles/files/49920997086.pdf In PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/dazamuw.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/someratuwofuxerowep.pdfIn PDF document text
    • http://tion.hu/upload/file/dapimerinirakud.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/gareruwojugirelegub.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/10473093319.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/1559642000.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/tobajosezu.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210912_025245.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/tudidokab.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/cna2u3572jmvqaimmcgnnrsm5v/bebigolawig.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/pipigevafuwa.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/58594467057.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/xukadowijuluped.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/33459924220.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613301fc5a837---kodotapavirigodemoza.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/63064503964.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/88447973487.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/tapubi.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/36399128863.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/gigemo.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-9/20210909122647736464.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/solifepakisukuronupigumax.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/33378009921.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/metari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=android+auto+moviesPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/7904b08956a13b9dec4a56618ff36577/tebuf.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_off0000e604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE604 10508 bytes
SHA-256: 6fea4aa61b92ed9b6a9cd62437ef0f3ec6185d37c3c7d30a905469406914547b
font_01_sfnt_off0000fdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF5 18016 bytes
SHA-256: cc003c26569a26fe8e84aef245016eaa7ef50f6a686ad63571323c1305f3c7cf
font_02_sfnt_off00012ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1