Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3c29f2c44b9684…

MALICIOUS

PDF

87.2 KB Created: 2021-09-18 04:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 34b3ec7483507e958d4fdeec05e495ac SHA-1: d5ba0c9ad05146a87129ea46df8d15ffb195e9c4 SHA-256: aa3c29f2c44b9684f681eb250df5bbd8721a29c153a4ce96de7c0a08e67a3ce7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external links, many pointing to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate a link farm designed to manipulate search results or redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or redirection tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www2.grupoksl.com.br/js/ckfinder/userfiles/files/46080536641.pdf In PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132839c16c43---kanurunifusoduvetup.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/wewik.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/fifebefivujise.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/91997990872.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/kafemiki.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/loralukovinutorujikepa.pdfIn PDF document text
    • http://drironcat.com/images/file/90334630574.pdfIn PDF document text
    • http://a-pluset.com/userfiles/8322887172.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/nivesivegozurakomutotij.pdfIn PDF document text
    • http://signauction.net/userfiles/file/wafepisedavujaxuf.pdfIn PDF document text
    • http://ibb-online.ru/f/file/28145719677.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/80650950610.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/fegatonoku.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/8bef0b6d341c7296901b93c6fbbf973b/mavakefizedime.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/goguzomanufepoxiz.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/javoturidumejokebugajup.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/fitevu.pdfIn PDF document text
    • http://bndweb.nl/upload/files/bikezelelefawasilepubo.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/rovubigekemipodesosifefip.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/tedexuvepikopanipafeje.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/zujipolobatoxemiko.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307c601e224---rodofetu.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091611212773499.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/sewegugoluxuxamujovotep.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/84094069061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+use+facebook+messenger+on+android+phonePDF 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_off0000f01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01F 11432 bytes
SHA-256: 6aed92010083599d788b341c516864afcc9bb6537ac731d1b1f74037887780fe
font_01_sfnt_off00010a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8E 17156 bytes
SHA-256: 84670af68b29dc13cf1d55a2fb5c3d4548e118e9375e43e4e16c5bc82b5c6d97
font_02_sfnt_off00013686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13686 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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