Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1f781842a59d22…

MALICIOUS

PDF

84.5 KB Created: 2021-09-22 21:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 18db8c1d2dcf415414402ce00a303078 SHA-1: 568b1263443fa1ffe2fcf48bf3cc4e8a47367846 SHA-256: 9f1f781842a59d22c81e647f6bad53646ba19be016041d6a632b4a312d25e771
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to numerous disposable domains, suggesting an attempt to obscure the true malicious destination. The presence of a 'download' button lure further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://shoreluxurylimos.com/userfiles/files/ludimivomazojuzidu.pdf In PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/e3749d22d5c6bb785e2091cb40880444/jilijulekotimoz.pdfIn PDF document text
    • https://baongochoa.com/upload/file/13133065049.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/xujopusodefitegogagigi.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/67499116153.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/21202247272.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/xusanikaxaxokefoji.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/99769985536.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/reverojabijosufunesa.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/vebotojivafilotisirexiwo.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/86828026285.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146305d39561---jajori.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/82236642806.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/wurobozej.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ea968f85b---76106220200.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/fonovanuf.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/68371237562.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/renegekegadad.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133d7a52910c---64014452754.pdfIn PDF document text
    • http://dytac.hk/userfiles/lemosofifoxuvetuno.pdfIn PDF document text
    • http://alptw.com/images/files/52154986574.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/padomida.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/48302216255.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/patexewuvu.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/9c98829f797467e20427f97d0cb78c79/kuwaxurumima.pdfIn PDF document text
    • http://zeci.nl/im/image/47147591875.pdfIn PDF document text
    • http://rsentco.com/upload/file/96041974042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=new+phone+ringtone+punjabiPDF 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_off0000e6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C4 10748 bytes
SHA-256: c776c5139f5494d9017312e558f220523e990338b8f71c58a7778a07dc103557
font_01_sfnt_off0000ff39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF39 17128 bytes
SHA-256: d26ed6b0d9892c272af068c7c8dfb0d4cc906fcae98d08a7086ff146db4eec95
font_02_sfnt_off00012bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1