Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea4e7a49a4a76ab…

MALICIOUS

PDF

74.7 KB Created: 2021-06-10 09:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b643543b8962470bb6bca94c85da8760 SHA-1: 6d6d0e67dedf2fa32b5108bb43b97ffcd88eef95 SHA-256: 4ea4e7a49a4a76abe0779640ea17eb37160b7073d5ce8545cd168311fa7ae818
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=windows+7+free+product+key+2020 PDF link annotation
    • http://mulroyenvironmental.ie/userfiles/file/48450016089.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/30119935584.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b769c56606e---97634521726.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/tewarag.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/masujuxaguzolovop.pdfIn PDF document text
    • https://puppometalli.eu/file/dukudaxebone.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1071d4dc8f---26925005166.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/48836766322.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/finabuvaluxigatosum.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/gumedu.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f2774d38f---mijiduzitirilivigigezufu.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16c7f21c48---larijoganulamavuwox.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ebc6839a97bb69b9fad014835b3928aa/xalezulebe.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d91921b99---ranati.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607372f179263---61494898975.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/busivekunisumege.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC40 5532 bytes
SHA-256: f6664ca006b94bb58af0e7d9293d2b31580a60cd76926839fa80bf642cdcf5b0
font_01_sfnt_off0000ff54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF54 10636 bytes
SHA-256: 1e22228f1274b334ab311831930f447a94133f8aeb7dd7b2eac49065e4cb10a4

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