Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c906208b3284f0a…

MALICIOUS

PDF

68.6 KB Created: 2021-10-11 01:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c10f8ed8213ba800090938aef3431a0c SHA-1: e15e31b08be7d236fb3f5d434923bf45a24d29da SHA-256: 0c906208b3284f0a6b199ae5459f25c8fdc991cc8ccc1c8346229407006a6978
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that function as a link farm, directing users to various domains. Heuristics indicate these links are associated with compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://crysiq.ru/uplcv?utm_term=none+of+us PDF link annotation
    • http://lynxauto.ru/userfiles/file/gabalip.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/butasalipurazizuwarexabi.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/zobujakikurunozonogede.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20211006205735.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/gowenid.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1614433704c3ab---lokopotojesibadekuzom.pdfIn PDF document text
    • https://mikc.kauzi.org/uploads/File/31604214006.pdfIn PDF document text
    • https://ikansambel.com/contents/files/nafugifuxupewufer.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/6d45f15fc0e27d5fab02f743c4f8abed/95520511595.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/dejedavaxewopezix.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/futigosufawopaza.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616314e427dcb---puwosukefa.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/2065946359.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/taludozevomigagowixo.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16144f6fcd3964---duxilutezogexudis.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/ziwudusezoj.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/83860543368.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16144fa74af908---51138923900.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210912103142.pdfIn PDF document text
    • https://ijp2.com/contents/files/jiwazurukaxi.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/51917990341.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_off0000b0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F6 15508 bytes
SHA-256: c1c877c02dc706cc8b8b026f94226efa1d9dab0e100935954bb1fafe39d981ed
font_02_sfnt_off0000f01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01B 9784 bytes
SHA-256: 4f6b0f732622942ff1ccaa5d0cb2081a3159a1f73da92b6c6292633a0f428603