Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9bb4ed835395a58…

MALICIOUS

PDF

77.3 KB Created: 2021-09-14 13:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01aab5c19e793b858c1a8901f9150765 SHA-1: 268dc254acfc0ab495919fec68d1806683f88f35 SHA-256: d9bb4ed835395a582a848f6594bc0ba3739fe7f1d3afa85fff2f68654cba5e61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are indicative of a phishing campaign, likely using the document as a lure to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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 https://catamma.ru/uplcv?utm_term=is+a+plant+prokaryotic+or+eukaryotic PDF link annotation
    • https://schmitz.cz/res/file/sowujez.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/13432645671.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/5ca424d842320ed61c68fabb4e7d4e8c/84561903822.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/63600928428.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/rozufovamopowigosomo.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/56214302083.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/fajizumiguzuketunoreji.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/67697873554.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///rununepavufafutunoponesa.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ac3e7eb46---6234020423.pdfIn PDF document text
    • http://vecsecity.info/editor_up/93314068989.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/f2a450de4f5450b2b235b3f81bacf320/mupopezib.pdfIn PDF document text
    • https://menu2uplus.com/images/file/padozeres.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/32354233670.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109041748455789.pdfIn PDF document text
    • https://pcetravel.com/files/file/5734660299.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/07d5abb10148dd62abd67e014beca252/pitigujavuxemujip.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613151d18fa03---wozomilifepuvamobelenifug.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/lepoditebatepevovaduku.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/zawazawujezomagibuxuz.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/xiwivifarawike.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/tewefonedikovaliku.pdfIn PDF document text
    • 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_off0000c9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A3 17732 bytes
SHA-256: cc135786f20a7bfefa6abea51d360da94f72ec59d9fd33d70a857fa70bed157a
font_01_sfnt_off0000f732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F49 10624 bytes
SHA-256: f225f15c9b1ba3d2e9ad464955a92f9a1fe7051bbd46fdc016dd24c4aaf9ae8e