Malicious PDF — malware analysis report

Static analysis result for SHA-256 0485130dc167f75c…

MALICIOUS

PDF

78.5 KB Created: 2021-09-10 15:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 77945ce1b0836762e22c606de27e7aa7 SHA-1: 5c9d04f68b94865ab1494c0a72459c396b4ccb4f SHA-256: 0485130dc167f75c6a2debae0beb063751c13840c33f11f1e7d7fef53d87a0c6
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous external URLs were extracted, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://studiotecnicoarduini.eu/userfiles/files/47867774997.pdf In PDF document text
    • http://rovitek.com/userfiles/file/36940275842.pdfIn PDF document text
    • http://medrea.ru/upload/files/91041155785.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/femadupu.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/zekefeladetewotegigosif.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161335904c8ad7---54827935440.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/55345503832.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/64474278102.pdfIn PDF document text
    • http://ataru.site/js/ckfinder/userfiles/files/17965130165.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/kogibunitena.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/26265331194.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/70748550862.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/zufuxikoxivolevetegekizi.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/d4npn5pngt8bt64kps6tl6shgd/64034490573.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-6/20210906092027658053.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/nimox.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/7644e6100b272a1cac713714c773c2ae/73651186622.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/51588643978.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/73846901250.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/pajitowosebod.pdfIn PDF document text
    • http://health-bridge.in/upload/file/28260379160.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/ximugikopuzomiputowibaje.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/3767718931.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/gexegazam.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/78862083667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=mutants+and+masterminds+hero+highPDF 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_off0000cbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCB 18552 bytes
SHA-256: 4231857f1605e8866d64b543c6fc9393b8d720324cc1cb1c2b1f4bf39072cc9e
font_01_sfnt_off0000fc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC42 10744 bytes
SHA-256: 998c1fa4985057f47aa26909e508ef4bff624ff7449dfd65c23caa6c18fcb446
font_02_sfnt_off00011489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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