Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d8c8eebfb1cb6f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 02:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d49bf5030a6045bb2947d8a567077a08 SHA-1: 3be3dc18306bde1a693f7df4eb1337a1dc1f33b9 SHA-256: 42d8c8eebfb1cb6f80ce190a5cfcf9d297ec0ea527b7b045daaef5ca4486b46c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The presence of embedded JavaScript and a high ML classifier score further support a malicious intent, likely for phishing or malware distribution. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or trojanized document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://felixefontesadvogados.com.br/ckfinder/userfiles/files/temaxidukivesarides.pdf In PDF document text
    • https://tramtron.vn/uploads/files/files/ronilov.pdfIn PDF document text
    • http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/64879181695.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/xedujulutubudiruwa.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/doborises.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16134788541151---13649511960.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/81724592701.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/38602793803.pdfIn PDF document text
    • https://phnews.ro/files/file/30440363113.pdfIn PDF document text
    • https://electroagro.es/pub/files/fosogor.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/11201909103.pdfIn PDF document text
    • https://reniuved.it/file/xekitixokosabenugenem.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/xogomolib.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130461a05324---busizi.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/pizufofoxanewulenuvo.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161327c000bb57---46049742954.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/xivapagazem.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/xatovabiligimaj.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/nirewovuxagis.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/jejarixiboxevazare.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/56641452190.pdfIn PDF document text
    • https://afayl.com/userfiles/file/36383051759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=3d+weather+app+for+androidPDF 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_off0000dc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43F 17084 bytes
SHA-256: 53f30b2f23d3683df59901f6a2368c4e7a7c46de449df5c0f00a86dcacc2d1a8
font_02_sfnt_off00012086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12086 10540 bytes
SHA-256: e675110299cc081800056fb99a720677a67b7096f61123f72860b56d8b574057

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