Malicious PDF — malware analysis report

Static analysis result for SHA-256 e24596a408c89d76…

MALICIOUS

PDF

75.8 KB Created: 2021-09-17 23:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e05482e8932dd9ef1a0b0e5f236ca1be SHA-1: bb90880f196065c2339895ce2a8f94e078a45b7f SHA-256: e24596a408c89d76ec3c12d5a176311fe0c08a6f8bf8e29847a886eed5e9c404
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple domains, several of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for further exploitation or phishing. No scripts were extracted, but the structure and URL targets are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb3822fcc7---92790327890.pdf In PDF document text
    • https://aradovan.com/userfiles/file/junutifija.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/kekax.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/68433600419.pdfIn PDF document text
    • http://shopabrang.com/images/files/26268172122.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/40190639859.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/96242904990.pdfIn PDF document text
    • http://proxima-online.it/public/file/46277122082.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/10334971758.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5e47d5d9f---paxubimozos.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/mitatutebatorexaziluxoz.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/fojoritebanolajelanepuvap.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210914190812.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/kuvibirim.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/loweneratumiwelafakipomul.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/bewapajurewosozuzoxiw.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/23202058093.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/kisogumerero.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/putakukodixitexo.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/ce142186e416fd3d3699cfa515aaa3d8/sutaposupuso.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/dudivabexapevefopunetivon.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/67662937488.pdfIn PDF document text
    • http://rld-carbon.com/file/depozufevujipuzavif.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/3545bed1eb9803ac1de1802ebc260c30/mewenipudenozuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=material+design+ui+android+template+app+source+codePDF 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_off0000c167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC167 10952 bytes
SHA-256: 1acfa6945bcc31c730e4f7e63c7040b8869aabd4c0596323d4d8283407646e2c
font_01_sfnt_off0000da8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8F 17020 bytes
SHA-256: f14ecdf4e6445b27bab2b5180a38517f947fa44b558bb31b885dd7604d114bbe
font_02_sfnt_off000106eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1