Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5cd41c13557086…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 09:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1db9a5afe1cabbdb66b560691b720e39 SHA-1: 9f8386ab12febbffdef224de45a6c4834b3ae6cf SHA-256: dc5cd41c13557086d84ea9e97e71bc9a94f1a89f685e96e90f6d40bd1e5b3feb
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL findings strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/aa0587a80952d474e51d5fb46853791e/74258263826.pdf In PDF document text
    • https://pmsp-me.com/userfiles/files/92986413826.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/74320314851.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6d4c37768---23253525755.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/10108144401.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f22785c7c2---manojofefosidufoduwu.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/tokuv.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/ivn33odc2dsrp7ddib7mdt5aii/joretizunuluk.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811f4dc6499---27108129018.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/193f7adde9d655fc292fff270fb4c440/15621863926.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/83504232314.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/ranene.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/69042730948.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/zonononilidisex.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/b93851be364c938820b8bb16c6cb5b3b/85363710514.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/77835162958.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/51530023218.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/57967502940.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/536l8qg2ufv99ff4u4t4qa4aeg/vesirironozolaxawo.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/9r1o416f3ta60asjtvlv3hvso9/nupavotoxerowamuzurezim.pdfIn PDF document text
    • http://www.asslar.de/downloads/judev.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611087b76c8af---sazabub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=beyond+time+and+space+chuck+missler+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://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_off0000d9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BD 11244 bytes
SHA-256: 5c1a1ddb6b4d942fc7316896522cba4bb1bb675262ef92aea94a8643b6063a67
font_01_sfnt_off0000f3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0A 17760 bytes
SHA-256: b6fe1554313b0644903259ffcd20c99f51f8a828a32df41fee1eee2745ee78e9

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