Malicious PDF — malware analysis report

Static analysis result for SHA-256 f02b65ed500204db…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 06:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 26584d9b4b97d120b9d1cd77905e9c35 SHA-1: 6abb5b9ac65517e886f8717e1df8c65e9081ea11 SHA-256: f02b65ed500204db38dfc458f79c34e18fd7366488cf5b124ade34685e548f78
196 Risk Score

Malware Insights

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

This PDF document is classified as malicious and contains multiple heuristics indicating it is a link farm and a remote-support lure. The document likely aims to trick the user into downloading and executing a remote-support tool by presenting itself as a legitimate communication. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or social engineering attack vector. The ML classifier strongly supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://alpha-th.com/userfiles/file/52208544695.pdf In PDF document text
    • http://munsusa.org/userfiles/file/20210526171958.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/bulolowenez.pdfIn PDF document text
    • http://littlefreddieking.com/clients/65037/File/32408657697.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/vovadomi.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/mezexigojokomidewase.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e43140013---19592786179.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/73393543747.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f240d729305---nidoteridavifizop.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/letawulu.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/87669914249.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104575783d8c---suwaxujikoj.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/7386896603.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/golokakenomokujukinomo.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/xiweganadoz.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6f0331f77---supofunipu.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/58200390807.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/mhqqsqt5kvr0f4va86mbevrb5g/26961805483.pdfIn PDF document text
    • https://shunnasato.com/96799608556.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/nupeberojorujiraravuv.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/39926352627.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161143d16c98c8---18736658542.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/xojutuwelepirimuzovunizew.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/puzazibuwopeme.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202107010042196892.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076004cae98f---zotasaginalifurufalaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=craftsman+36cc+chainsaw+manualPDF 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_off0000dcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBF 17008 bytes
SHA-256: c5957a49cafa0db7783f610ddff947735c2a42214206447613f7529559203ed3
font_01_sfnt_off000108f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F1 10908 bytes
SHA-256: ee9fd37251c4027ee8875b8d0b93a2cf070419b442e4f09ffd3153cd72bf2ed9
font_02_sfnt_off00012211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12211 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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