Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0938064e6e544d…

MALICIOUS

PDF

82.1 KB Created: 2021-09-08 03:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c0ee01d38e16a4cb9c2a4803e06f5637 SHA-1: b93f9711d40c8c2a9ea68f42f3741558b8dd4749 SHA-256: 4d0938064e6e544d3469158a595394e95c3dfe001eac5ea18c69c1d652dba410
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability for client execution. It contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a phishing or SEO manipulation scheme. The presence of external URIs and link farms strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://infrive.ru/uplcv?utm_term=nothing+gold+can+stay+the+outsiders+pdf PDF link annotation
    • http://dogoxuavanay.vn/uploads/files/karugob.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-8-21/20210821055540788864.pdfIn PDF document text
    • https://starbox.fr/img/files/61428633086.pdfIn PDF document text
    • http://vodnik48.ru/content/file/39359291925.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee0edc0a10---dufoludaf.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16070064303546---24939548138.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/6174267048.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/pimiri.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/eefa021420462585a4d92d39525ce29e/wefesejaruwedadid.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/16ed1738f4525a71aed31bb73d82d2eb/dawifamefepujej.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/23337174491.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/82444133380.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/85327018568.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6ba3892f7---logovafe.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085360fb7a75---zozuvadedabamuruko.pdfIn PDF document text
    • http://iltorg.ru/upload/file/susitolinene.pdfIn PDF document text
    • https://eubeer.vn/uploads/files/fawobarizos.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/fazipebi.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9563186f90---rodosixufaxeravere.pdfIn PDF document text
    • https://aeap.com.br/ckfinder/userfiles/files/28193975812.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/felometabokefebalojixoz.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6df6aae470---16104244486.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/97905004379.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/e1f5457570a50d664c8cd0f6078c5ca3/90971937170.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/bekelisu.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_off0000d8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AA 18904 bytes
SHA-256: 317eff3fac3523f2eb2104845d2657a4111edcef2205b300cd792688900d04fc
font_01_sfnt_off000108f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12110 11092 bytes
SHA-256: 07bc60024c99a17f5f0b3c14e0261aeaf9d6b82e8223c16d82791a9a9034ab9e

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