Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5070ae083a3732…

MALICIOUS

PDF

82.5 KB Created: 2021-09-03 01:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: b9730c1a9f95ede3f75d66e1f58d1a9b SHA-1: 98fe39919914438b281cf315946013aa5d723f67 SHA-256: 4b5070ae083a3732f7a1a873ed0adfc995f87fd7b0bf7c0f1a567d52495807e2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://inter-travel.hu/_user/file/46606763612.pdf In PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/54660110962.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///daxajiduzixitemixaz.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/33624630792.pdfIn PDF document text
    • http://susanirvine.com/clients/82887/File/togozij.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/5c9478a9d102e1a682b8363643d974b3/89476138345.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/51febc88f152612755a57eeaec3d54bb/mametad.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/sobisasiwoxikagilezi.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/72333dab1eeeec9ad0a587093ff4c8a9/fadoginemab.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/nuliwu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a341d9241ba---jutiseneremuvanuwulolife.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/kotuwexumarilizubi.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/ronilopumugavonunuror.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/zenaxe.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/f0dfec04999b61645d26c2f193f31a94/ruxaposafevuvodigom.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/jufotidusizujasexezo.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f9373e998---nokosokevedumojewunige.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c7552a3a47f---23717347783.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/bimuxugenanatuwojelope.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/83306632756.pdfIn PDF document text
    • http://riversedgefm.com/files/file/46731542121.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/1616588476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=distress+tolerance+skills+dbt+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_off0000e07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07D 16764 bytes
SHA-256: 1d94fb7170dc75a1edcd6478bac9518b6bb5046fadcda4084eebe53bad0e12c5
font_01_sfnt_off00010bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D6 10848 bytes
SHA-256: 2bceb7af377f9e64e892de2a9462387fbb724213de020fd2ea46f56acdd57c00

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