Malicious PDF — malware analysis report

Static analysis result for SHA-256 64350369207f9e53…

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 01:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ecac2e6a209b65cb3d81e86b5422f82b SHA-1: 76d05ed44add1b38489cd719703d8cff4fbdfa6b SHA-256: 64350369207f9e53d1edf3fbda5d923d565e198b6dc634a05a6e52eff4db3b54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dd95cf06f88---metasubuvikijawusupira.pdf In PDF document text
    • https://airflow-skateboards.com/upload/file/39488265872.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97f912450---87351053103.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/21087544029.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/xefivuwiv.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa66827004b---40878054588.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/tajogokeworomi.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/xalujexizema.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/85321695629.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/73543346330.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/47033124622.pdfIn PDF document text
    • https://tcremich.lu/files/files/nejomigovegexoturede.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/96071458696.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/kogefu.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160d8dec313f08---dojujepofivewarem.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/17af4225d328350211daec0a43d7016a/14386932706.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/rojanegaz.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/jatanipifo.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160858030506e3---ruxojel.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/1274ca4789796596848a0f34c00f733e/82147591196.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/k6fko58bl40p33fpifpfvcdjm5/sugufonogajosefifiwobo.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b2cefe4af6---58868356135.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/naluloxopibakunow.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/tixejesisen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=dzogchen+practice+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_off0000dbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFE 10744 bytes
SHA-256: 51c1f673100fb2bef09197ea97e25dc1548d09aad2b7fc1a8d1a8f77f69571e3
font_01_sfnt_off0000f477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF477 18016 bytes
SHA-256: 60a14ca22e3143aeaa9d8aed9e3f65525f82521231fd02f27c8fbc31de6a759b
font_02_sfnt_off00012297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1