Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6b0a1d2cf52fc3…

MALICIOUS

PDF

67.1 KB Created: 2021-09-17 04:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 575fabd08927081a9c6c388dbdf28554 SHA-1: 5f3c2f361d0105858c2a6c43ad805da9c51451f9 SHA-256: 4c6b0a1d2cf52fc33af458152136b8d93d3d2ef8dd008ab5c830d4db7506ad60
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content or download further payloads. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5690

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.
  • 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
  • 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://aordonez.com/images/contenidos/files/rinafupevezoxijipatomi.pdf In PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/67530291888.pdfIn PDF document text
    • http://szpk.hu/_user/file/welapowowubo.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/80032008894.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/xemogevimabobefipelegod.pdfIn PDF document text
    • http://ch-yang.com/upload/files/fifufolipodasukadu.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/10062354219.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/42854570254.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613245de91d2c---javojidixowadu.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1614241e97f1cb---32309316450.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/wokinorofafepibuzonare.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/rufaxipatedefes.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/xasoxisafemimapofigevubig.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/80896605391.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131663d5e959---6602228700.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/48627700805.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/boripebo.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/zapanepivuwizola.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109121916507128.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/tukagemad.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/gazibemokimafami.pdfIn PDF document text
    • https://limsurempat.com/contents/files/fotikaku.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/soloze.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/jozepof.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/dajajive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=2048+bubble+merge+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC24F 18060 bytes
SHA-256: ab01a2c32a2a41aefe6785d5c9ac64690c963c7f3554f25f3ecaad05b4689c24
font_01_sfnt_off0000f07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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