Malicious PDF — malware analysis report

Static analysis result for SHA-256 5543182eab153d0f…

MALICIOUS

PDF

78.4 KB Created: 2021-09-20 23:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7a011275cbe53a1d86e8619a471ea0b0 SHA-1: b75178b7a7bc93d0f1d2aba85ff62338ea156349 SHA-256: 5543182eab153d0f19aeee309891d4d492539d26b0ae2713ae9a4fdb874cf206
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of numerous external links, many pointing to PDF files hosted on potentially compromised or disposable domains, suggests a phishing or malware distribution scheme. The primary attack pattern involves leveraging these links and embedded scripts to deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://1am130r6h1n1-k11a7.com/contents/files/lupopixinadovidi.pdf In PDF document text
    • http://asustainable.com/global/file/65828604903.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/1171251663.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/bf92a9acd8dc201c3ef783b1105e61cd/diniwe.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/3382436271.pdfIn PDF document text
    • http://njchemland.com/upload/files/51588400111.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/gaturamumixiwefexumagur.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/gaxulozemelirujurawosovo.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/bomit.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326189c5d8d---fugumajidoji.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/jilavatesodut.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/lupumilapaw.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/60f087d3f69644f8f8428cec7ec65374/60273587256.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/rikudegu.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/20449927665.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/xutarirumeged.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/verojomasatuvulesijaga.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/72039689228.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/jonek.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210902075154.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/xewobena.pdfIn PDF document text
    • http://www.bash.cl/media/file/28963710450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=group+chat+video+call+messengerPDF 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_off0000ce2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2C 17136 bytes
SHA-256: a623630cff9bcb685c4d054861a9bc74eb8fdb2b6023b22aa30da8846822b2b1
font_01_sfnt_off0000fa34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA34 11168 bytes
SHA-256: b0cd31c93e32dcea70315c81e03d925b7977f8f0f9c819725f60f991f318f6fb
font_02_sfnt_off000113f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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