Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9bcef851a9f3b94…

MALICIOUS

PDF

92.8 KB Created: 2021-08-14 03:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 05b0beef8a9e4e074406749f0b59f3db SHA-1: 72fa277547f06428561cf1231e03438c84d9df80 SHA-256: f9bcef851a9f3b940fb4e2bc5f3bf6eb030116552245c1467621e6a305aac1e2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable domains and compromised WordPress uploads, acting as a link farm. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://inwebjor.ru/uplcv?utm_term=pedir+vida+laboral+internet+pdf PDF link annotation
    • http://quick-thailand.com/images/uploads/file/mopenenuzemuzolemulokezar.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753816cc407---95119033693.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/7871723560.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/a826a6cfa50b9a6a6361994f75cc4dbc/jibojozinevazebo.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109e45b4633b---68080708157.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/32403570905.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/328d371cb0a24d1dc4fd77a16a128e3a/tivononavitinup.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/b8a5b27662160db9c798a2e9e9be22c4/5618170260.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d03e4fee3---51783775122.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/junefoxejeratasutupi.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/21mm40o5u4bubjumpvko7eacd6/57833599151.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/51473387390.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/65878595157.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608621194ec5e---suzox.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/41984110411.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4f57a434b---povopakojodede.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/50982570255.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/83362740103.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/wefalovowasolirisomi.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/tadebi.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/ranimumug.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/82066303023.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/ucemsfpmvi8qala65hjeptpufc/pajenekibibupiginu.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/96864916483.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_off00010522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10522 18184 bytes
SHA-256: b4b88374c4b688f8dc9035d84bdb61b9dcbcb993c062d46dcceeadcbc4feebbf
font_01_sfnt_off000133bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD2 10532 bytes
SHA-256: d946dde22d287671f0e216477d89433482932a1cf4122f502da5186f2868534b

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