Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0b9c8d94df89eb8…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 08:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ba186b31b2e03ed1d71202a9c92dc0cc SHA-1: d32d1e87b25c5611607a694125a6587cdee8d28a SHA-256: d0b9c8d94df89eb81551638c50573761562d675acd65dff03c0a556ddc51628e
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 associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://inprovit.com/ckfinder/userfiles/files/vukibujop.pdf In PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/445c24d46a38b77098af0ed166e123f4/10939097242.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/nojedanovodusovekut.pdfIn PDF document text
    • http://ciskmv.com/css/file/51104532085.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/71393270387.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/70211713390.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/47926615099.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/19184598034.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/20017671226.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/teweponufigo.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/wakib.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/81472479334.pdfIn PDF document text
    • http://01host.ru/userfiles/files/86916942761.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/30132531119.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/da5e9a6b7f1edd377ef12b8a75fdf520/wexobaw.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/dibedomirove.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/67766583906.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143bf33c21ec---60749537445.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/kiparurigapazeruto.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/bonelugotuk.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/86334800388.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/sumifonekinijo.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/tudejivanuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+tudors+charactersPDF 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_off0000b2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D3 10288 bytes
SHA-256: d5bec99c5369e747f6a1735f6ef47fb67ed4468ee3a194f60d4ae54f9f3f0723
font_01_sfnt_off0000ca24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA24 16144 bytes
SHA-256: c081a1980ece3c05953aec1b28b36e304a6e7846879e2d3fd33b413c313121bd
font_02_sfnt_off0000f3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1