Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ad6fcd85304154…

MALICIOUS

PDF

77.4 KB Created: 2021-09-15 13:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3772c43783e80dba0a64857709b0233c SHA-1: 13d7b2ffa7acd594f303cc60ad0c4cf6f9fb57ad SHA-256: 18ad6fcd8530415490d67f8d2a37526e32dfa4c6079914430679c2853d7dc2c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to potentially compromised WordPress sites acting as a link farm. The primary purpose appears to be redirecting users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/de3e5054cb580fb39e1ca547eefd101d/7153820269.pdf In PDF document text
    • https://smsenerji.com/resimler/files/49537466231.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348c8796885---3449674563.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/kerilobanutu.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/vosusarakamexiw.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/sugipefuvuravi.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/mavasolomodo.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/65878579945.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/7defddf82f35f8e0b4ab85de4fefc2e6/jivamojiladodatajofulibum.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/rakizoki.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/14455905354.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/sazupifupawowotozaxaj.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/19688107820.pdfIn PDF document text
    • https://kvzriu.org/images/file/lijebidi.pdfIn PDF document text
    • http://keacg.com/upload/files/zabojojomagutatonifog.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161412f0ba6f27---norofovedamudu.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/93986394506.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1631521789dea2.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/796314361.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/ruferawunuv.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/46997224324.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/mulinine.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/kalifuvifegaz.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/42014231370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=marie+curie+reading+comprehension+answersPDF 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_off0000c9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CF 17400 bytes
SHA-256: 029a95082cafaea4f322e1807e26c131a305ab86d18a871c39dea174a3dd3992
font_02_sfnt_off00010e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8E 10996 bytes
SHA-256: 796d7459a7fc95c9c097e4bb823e2216f9c569825cbfb2bffe76ed5d73db30e4

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