Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b2a54c14a7db2c…

MALICIOUS

PDF

81.2 KB Created: 2021-08-29 11:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e4653806137c7dbc24d7e922a7995ef2 SHA-1: 24905553abe1b1622babb8e92965745f774f0790 SHA-256: f4b2a54c14a7db2cd40fa744c5defe53fdb5a830358ca9a9035be35ada81249b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites and disposable domains, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pixomot.ru/uplcv?utm_term=download+game+ps3+highly+compressed PDF link annotation
    • http://cs-web-design.de/ablage/userfiles/files/dopobalikewe.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/vgclbk29grhecaflspf983jif5/sanelogavikediluruji.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/fanikarekaxow.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/57252025686.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdcfc05e71---89872154535.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/4e24df342fca9e4b23657b78ffbc8be0/44133312382.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9a47ae8e9---vinovusawuziwugilepanozed.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/ratemimolukiwosal.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/00dd745c6b2f785a11180caa3b8a710e/40916648095.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/wopelobitasese.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/18588388226.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/81483606843.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/44930216823.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/fudusonunegite.pdfIn PDF document text
    • https://osakadentalcare.com/contents//files/15964957984.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160770e6dc1ea0---bupulutolitakebepivu.pdfIn PDF document text
    • http://cocoal.com/uploads/file/funesiduxiwelisasave.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/72061527236.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051602095973499.pdfIn PDF document text
    • http://bakoca.hu/files/file/tagekoximufamak.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f2ba3951c---kufosixekemodatef.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/31541687960.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_off0000d74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74C 18204 bytes
SHA-256: 8e9e53391864a5ea27322345dc63a44e1ca7388c87a66e1fe1c4c6d52bac1da2
font_01_sfnt_off000105b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B9 11236 bytes
SHA-256: 787aa903afc046bf062394b638a83c44b60ebabc2da8960c0e1cc587ba084c2d
font_02_sfnt_off00011fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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