Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f0b7bf6e5269bd3…

MALICIOUS

PDF

86.1 KB Created: 2021-09-17 18:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 300df6da3b0a1c264b757f0187d4afe5 SHA-1: b23df53d23737fb79a75d39f7e60988a18d66e04 SHA-256: 7f0b7bf6e5269bd3d7c4a09df3c614ab9af459a975600aa7fd338c5ffb0e69c6
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristic firings and URL analysis confirm its purpose as a redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://shopgraeagle.com/ckeditor/uploads/files/jugalesidogemuve.pdf In PDF document text
    • https://rireenfrance.com/images/upload/files/76025209114.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/mivexuwe.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/64855222129.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/73596797627.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/reramexufukanubufefin.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/bawegalijesekimumuwegep.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/vedada.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/mexelinilunikovuxuvev.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/luriwexujevamuru.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/motunonirinidu.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/93383697889.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/255946583613ddc087d0a8.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/79f02cd93ec193a623570d7dad350f90/xupusewu.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/luzinumaxa.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/65209774547.pdfIn PDF document text
    • http://gestioniarmatoriali.it/57860192757.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/jovovujegurasarepojetid.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fac004210a---gilegoxoforutumerazevuzi.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/99048598033.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/sovafupabasedadap.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d320061e58---40182145337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=james+patterson+pdf+book+listPDF 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_off0000e952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE952 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10164 18572 bytes
SHA-256: 8f62d1fcfbc58918e28648cfd316a9c9b17b154c7b03f9f4ddfc8204d76c8e7a
font_02_sfnt_off000131e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E0 10884 bytes
SHA-256: e6e661b1b7a75fca518dcc6de7860db09f5b08892a3932bfc1170b1ded6a6c33