Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1efdcec6e16e4df…

MALICIOUS

PDF

89.2 KB Created: 2021-06-30 01:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 278fcfb808824af487959ea6257f7b49 SHA-1: 198390f09890b52be07cc2618e7b339a45025c98 SHA-256: b1efdcec6e16e4df491c80a751ca3304e61c55784dc3ac298407b1f95b02f9ff
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Numerous heuristics indicate the PDF is a link farm, with many embedded URIs pointing to compromised WordPress sites and disposable hosting. The primary purpose appears to be directing users to malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://synerhu.ru/uplcv?utm_term=indesign+compress+pdf+without+losing+quality PDF link annotation
    • http://africanhairbraidingsalon.com/userfiles/file/xizedavaxuwedirirosuwesu.pdfIn PDF document text
    • https://rotherelectric.com/files/degirevovepoponiwuraz.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/dikatavukagoloton.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c05a1beb4---jevusamitadejuwazu.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/59adc6ff84c20db39a46a9f70028e886/jitekobixukam.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/vaxogenilujudasipod.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/a85b14e7445ebe29bafc6c82eccb72fc/foguworikuja.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/wuwij.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/6f3d2bf360c09c59786446b4eca7e693/saperixikawowekaxovipasun.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/kejilatanejib.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1609605e8dbd86---12120342036.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/bonigufenitupoj.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9abf689853---71257693615.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/8803684bd11d7146dcff9929f6919c8f/97145248484.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/4360970554.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/05070469112446334a71acfe3191c8f3/jivemudu.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/010900278615.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/10eda85dc54a075bdce4ad17a42510b2/joduberukoladudo.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/binikutapovijadafaxoga.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090bea93f219---selinowe.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d46d9c825---91369707419.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857c740796f---levuxagubiloleb.pdfPDF link annotation
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85ea8d7953---zimujuvututetuwomo.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_off0000f685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF685 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E97 17604 bytes
SHA-256: eabb43b8169ceafcd889197a24da58d1670f8943cbb05e4164dd2149610ddd9b
font_02_sfnt_off00013cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD2 11464 bytes
SHA-256: 3efaaf3b27958cf105ac98be8965ca514c5778041b917b3432145da856054169