Malicious PDF — malware analysis report

Static analysis result for SHA-256 a187cbab9a69b38a…

MALICIOUS

PDF

85.3 KB Created: 2021-10-05 11:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2f9e8205bf7068ff1b10eb75bbdc3a6f SHA-1: 372a0f7561a9ea6edafeea5934a1af1427eb4718 SHA-256: a187cbab9a69b38ad726b95260b3b7cf02f70fdb4d7087973e382e8f79ce6c75
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on compromised and disposable domains, a common tactic for phishing and malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a method used to bypass gateway security. ClamAV detection and ML classification further support its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • 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://limberhurstgallery.com/imageuploads/file/92771139677.pdf In PDF document text
    • https://llibreriaha.com/img/events/file/fomobomiriwolonar.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/kimid.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/34715699931.pdfIn PDF document text
    • https://databaze-zdarma.cz/userfiles/files/muwunapososogedon.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/1411378209.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/92030630604.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/74451872379.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/79092620172.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/punularasatamokazela.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/lefemarezifa.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/girovetosana.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/busukexejulidoxujote.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/10872676740.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/m2q6gonfeb6hq2dhlq1p56k9uc/talapile.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/xuneje.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161586695d60ea---94501330854.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/31327583139.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/manufusazite.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/86354268621.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/tititirekezofanakofukewi.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210905161258.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/jozafovoxabozokof.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327da56fe67---3066539504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=remove+secured+from+pdf+filePDF 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_off0000e3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDD 10628 bytes
SHA-256: c7c3c9ec22df6f91afe532586681946556526d5cf6cf268e2c7f6d339c0c9c03
font_02_sfnt_off0001142c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142C 19588 bytes
SHA-256: 8bceb4e75627b37a952e8a7c0a2d7b15ee23fa8a07b74f654da0df01fee3d078

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