Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e456673ba77e541…

MALICIOUS

PDF

97.8 KB Created: 2021-09-01 07:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b63fcaa6e41da2b5330749b29c3cc1fd SHA-1: c13d26a2965dc813475a861c846d628f13387eb2 SHA-256: 2e456673ba77e541d46d7cf134ce8810c194575e04e06ce172c351fbfc1e2d3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to domains flagged as disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • 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://www.acta-mobilier.fr/ckfinder/userfiles/files/19736810629.pdf
    • https://rockyhotelsgroup.com/uploaded/files/39703408171.pdf
    • http://yangs-ns.com/ckfinder/userfiles/files/20210815122104.pdf
    • https://haisanquangninh.org/data/dulieu/files/41340509251.pdf
    • https://bwawarszawa.pl/upload/file/2117201244.pdf
    • http://greffedecheveux.center/upload/ckfinder/files/jikidikazugobeboxexadonuj.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/27022849443.pdf
    • https://hasekei.jp/userfiles/file/zodinobiwimidediz.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/cbrhpa6u5075ot95p3isalfghv/44039347551.pdf
    • https://veterinarycarefoundation.org/userfiles/file/wawerixemuzojoluninu.pdf
    • https://dolphinsolutions.net/ckfinder/userfiles/files/89774962966.pdf
    • http://se-ty.ru/uploads/userfiles/file/fifokimobaxuxeva.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/3d4ddcd2dc22713ac324f3e21711e336/84140170226.pdf
    • http://sxhk365.com/uploads/file///72539703006.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea0df60e64---musewugozifaxa.pdf
    • http://imaginove.eu/data/Files/lurumivowegufowakajo.pdf
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/11321911728.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799c2ef32d7---kazexozepopizizaw.pdf
    • https://vietnaminsight.biz/ckfinder/userfiles/files/fizajumu.pdf
    • https://hasekei.jp/userfiles/file/guniwodipimobukizepepezu.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd3fc9321a---wixone.pdf
    • https://atamergranit.com/userfiles/file/gewezaxatikozes.pdf
    • https://camgloberealtor.com/userfiles/file/28870428152.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/2a2e8e0808eef0de1ccd6a68f243664e/24161285757.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d03045a2d---nunizesa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=west+palm+beach+median+income
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x116CC 16792 bytes
font_01_sfnt_off00012ede.bin
867922282f15a7bced7fbdc9c6be8d13424e67893bb5aa4f3934ce9d08c1b1c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDE 19168 bytes
font_02_sfnt_off000160b2.bin
8fa997c964d41fd22d85ca69ba2b1cf6f7c0626918c5f96c8939b5dbf2075f31
pdf-font-stream PDF embedded font (sfnt) at offset 0x160B2 10812 bytes