Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1632dfaa92dbb49…

MALICIOUS

PDF

84.4 KB Created: 2021-09-19 15:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 90129753db568b64888f741608e4f348 SHA-1: c4b2e3b8d606be06a9f3b1d69db29506f279e83a SHA-256: d1632dfaa92dbb4996883abf8b54bef6f968a419db820bad0de5a309278581bd
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://sysquare.com/UserFiles/files/winexoxopavuvewe.pdf In PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/wowikikigijikexesuzogen.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109050201505642.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/1519460232.pdfIn PDF document text
    • http://sentai.cc/data/file/20210908_112842_848.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/dalexokixadaxamumagumam.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/69183803470.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/34331928941.pdfIn PDF document text
    • http://dakov.hu/_user/file/lulurenanovamit.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0aef7c30e---1689643962.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/38261358639.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/78045906154.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/68398323761.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/80565859434.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/75465628174.pdfIn PDF document text
    • http://bbu.vn/Images_upload/files/53039253903.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b93d24a35---ritovizilitesudagulomevi.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/39020412895.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/tofulusugi.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/sup045gobtsjidkjlq9t4eud42/pexunu.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/69079361700.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/68966280103.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/44699631653.pdfIn PDF document text
    • https://medius.sk/userfiles/file/pufatilizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+zip+folder+in+mobilePDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/gomaf.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_off0000e4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C7 10604 bytes
SHA-256: 0cb08f4a15c394f8048e7b947f3cc4b890350c4c0b8c928ba6b780a3b6f108d8
font_01_sfnt_off0000fcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB6 18496 bytes
SHA-256: c3ac8bc47bf102b1a545b557f8fbb874155c129bc881da26d408ccf1ca52ba8f
font_02_sfnt_off00012c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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