Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da3552c9324890f…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 22:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4335f7c3f4e9dbe53875a9fadcbd244d SHA-1: 3c3e9aed0fd46c904614b2dffdf0f0529142561f SHA-256: 4da3552c9324890f2ae345d521da37eb3bb9c1cda4d3e7bb7edb7272efa84588
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm pointing to various PDF files hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/68100845151.pdf In PDF document text
    • http://tcsklife.com/filespath/files/20210904125809.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/273b15356c61ba05e09911b9e25b1a7d/16671048871.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161413c710e32f---tamogemejuxeri.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/tutaga.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/miwulovek.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/godatomiluzix.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/voxasikebixepu.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109031752049022.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/45593391367.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/45291342843.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/64368995228.pdfIn PDF document text
    • http://ruresept.ru/files/file/fufikujekaxixusakiz.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210904211029.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/91458632322.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/88546669269.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/nizuposizi.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/3f776810c751e684686360eca5c3e21e/1445440730.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/18694155161.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/dawuvonijuzudif.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/vinevezaxewosakakoxuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=dragon+ball+z+kakarot+ppsspp+download+apkPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB376 10720 bytes
SHA-256: e248a4d3874a43f1eccd195f48e32d450b61a5d62ea89188020591fddf8d0310
font_01_sfnt_off0000cbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F1 20688 bytes
SHA-256: 42b556a4cd5c855dc20c28451b415080c89f2e4d5a514165a6c91a044d04580d
font_03_sfnt_off000118a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A0 1936 bytes
SHA-256: 581ee6410b39f3fc3c0b7eee44a1f688a16d32601ddb4ff915e7da4a385d4a1a
font_04_sfnt_off00012193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12193 16280 bytes
SHA-256: 6c2373af9f418d6bf213df99f682b881f883cc510106bad74565fdf518858d7f

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