Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f9b9954115f7ee…

MALICIOUS

PDF

87.2 KB Created: 2021-09-16 17:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b595302dce23da6d7716b480f9434130 SHA-1: d039595dea42700cd325e1971071af89dd91e638 SHA-256: 95f9b9954115f7ee7db7fadf4cbb22283ab14d85cebb72fb8eefc9f5b0769fb7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves luring users through a malicious attachment to a series of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://steelbo.com/uploads/admins/u0/files/20210911030905.pdf In PDF document text
    • https://portalbime.com/UploadedFiles/New/file/4431951371.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5a3f3a061---resulamujirubomagarinijix.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/367375651.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/lobagitomekigikubu.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/59566746543.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/88105031150.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e29cdae9b702ceb5293294f8e870bba6/68125515773.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/31506141824.pdfIn PDF document text
    • http://gestioniarmatoriali.it/57137921215.pdfIn PDF document text
    • https://ccs-corporation.com/ckfinder/userfiles/files/99786985677.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/ropidu.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/13994846104.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/momiza.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613487b57d918---62256439313.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/zurojomomugomujiruvik.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210906025842077793igabct45f294.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/nomutagatigipamifoxa.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/10325704910.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/84832359583.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/10759938975.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/19001960692.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/tunaxozawe.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/momujusuvumokenalokaluj.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/pn7ipimcrhpdekett2rbnvbk91/jufuluzoresigifakujikawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=best+shark+games+for+androidPDF 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_off0000f272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A84 16960 bytes
SHA-256: e5a8a58b89b228a01ec3b9ab914a94e791e67189141fe3f1633becb09dc1933f
font_02_sfnt_off000136a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A4 10900 bytes
SHA-256: 447b6c2a65f4eb100091b775a07535b1759a1fa16522ef2460e3447560528521

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