Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd828977a8877fb…

MALICIOUS

PDF

86.3 KB Created: 2021-06-24 15:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 74d9a503ae14eec9ad86d21bc52063f0 SHA-1: 6ba19f54c5985f54be963db9dd32b8d0559333ac SHA-256: dcd828977a8877fb04909082266e93ad2a71f0ad9711069844cd9e78caf0fbe8
156 Risk Score

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608215b6d0f76---53957641305.pdf In PDF document text
    • https://maintogelonline.info/contents//files/jobofosivefon.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608296902ce4b---wesevigudokowomifikuroxi.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/e4b5f850a67f44222b70961ee747edc8/66965673879.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/takizinexukemowepesu.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/mimotorix.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d022a7f9d---38132881696.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/0c12ef9c7df4e39a9afbae3ceb831d89/rotunuf.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/ad4a3f7d9784577da80caee749d02990/deses.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073ab14a6058---12209599393.pdfIn PDF document text
    • http://planbmedia.hu/files/41909061630.pdfIn PDF document text
    • http://accronline.com/userfiles/file/sumux.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/rajokefazif.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/d102cb74d7bd79c67a823fa5a723515e/romivo.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7a38354fa---sobabesusirat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ava+1992+pdfPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10322 4444 bytes
SHA-256: b26a1357e828ba7e1d92af0403012531e91a67853851c3b079b0911546a6861e
font_01_sfnt_off00011242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11242 14444 bytes
SHA-256: c5e5646208da97f929c5c09da689ceae93b96c9bb8673c7eabd34f200edefbd8
font_02_sfnt_off00013d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D61 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71