Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52a97596cd1a2d4…

MALICIOUS

PDF

78.8 KB Created: 2021-09-24 03:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 376a4424b2b2147511ceb66aae748386 SHA-1: d4132a61deaa60a8be5b070ae70afe534601ce4d SHA-256: d52a97596cd1a2d4eafbbfe9b7d6fcab1f6eaf68defb5511a49bc520a69d2397
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains malformed streams and multiple external links, indicating it is likely a lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect the user to potentially compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://sklepbonus.eu/userfiles/file/9166554067.pdf In PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/96882127666.pdfIn PDF document text
    • https://www.parcdelorval.com/ckfinder/userfiles/files/40343380089.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/p75t0mjl5n87s7uddtvi25irv3/luveruzekiwogesemexekezij.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/68065778896.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210912100815.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/likinitakukuwon.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/f00c873bf7c67d5b4e96d31072a9c017/xazabisagiwixabukusob.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/70779988479.pdfIn PDF document text
    • https://babycloud.ro/app/webroot/files/userfiles/files/vinevexawobuxem.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/bugosojosarebokama.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/3182066448.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/15514507559.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/74309931273.pdfIn PDF document text
    • http://519pf.com/userfiles/files/pujexejatibut.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/mijupifosatarugofamiwir.pdfIn PDF document text
    • http://headrepublic.pl/images/files/8971040884.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/47720276681.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/xefufenen.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16139d2eaaa5af---salag.pdfIn PDF document text
    • https://merlak.ru/userfiles/file/41483725181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=minna+no+nihongo+test+pdfPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/47820396999.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_off0000c658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC658 21584 bytes
SHA-256: f1bf3ef1e5b777ace4da937426fb40fa654d591ba7d7cce8f9b805ac2f401841
font_01_sfnt_off0000fd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11588 10624 bytes
SHA-256: ea097b376ba09574b84e0a00ad6ab26dddab75a42009c102c0d2c0fb12695a49

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