Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11f22fbce89ef47…

MALICIOUS

PDF

87.6 KB Created: 2021-09-12 06:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3d81bccfdb785d7d1c1060a276f6f323 SHA-1: 0167c753750166a8fdb13841d360c3b3645327a1 SHA-256: f11f22fbce89ef4728f8d811e1969cbd8b21ff71b7556380a4d31a20ff68d770
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. The PDF also functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. These URLs are likely used to host further stages of the attack or phishing pages, as indicated by the 'link farm' and 'compromised CMS upload link' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://wastran.ru/uplcv?utm_term=captain+america+the+first+avenger+full+movie+download+480p PDF link annotation
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed05a4942c---44735178185.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/c5b96ef58ed912df2fbecf177e90dc61/lamamoniradazeka.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/rikije.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613925a9e44b9---wuwivadixidaja.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/zozusavelogafolizonedel.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/ripiratedewesonu.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/detazulebibu.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/muxex.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/7096549697.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b537bd11fa---7665057368.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/juxalawuveka.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/18588619741.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/tilunimusof.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/89231332033.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61246080662.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/suvez.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/70240604327.pdfIn PDF document text
    • https://rippa.pt/files/file/mivuzaderorug.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/17173752931.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/u56t7m21es8dv5r5921lumvbal/rilorasarinubinojileveb.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/58085432793.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/72857641678.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/bepifezosemogiremuket.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/bajis.pdfIn PDF document text
    • http://myphamasia.net/upload/files/90939201221.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/seremuko.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_off0000ec4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001045e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045E 18368 bytes
SHA-256: 1e263a6e89dd45df65756fbbeac107a3f56c2071c1e4e82f881d5ce5475f34f5
font_02_sfnt_off00013430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13430 11756 bytes
SHA-256: 347eac137dbac1dfe489b0a4d056418f140fd23a6cf2d8f79beef576b6bf1cfe

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