Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5ffa5c8dc1da25…

MALICIOUS

PDF

96.5 KB Created: 2021-07-31 13:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6348346a65566a156533ca328af17daf SHA-1: f7f794af9272ea02468d3348294ced1aa9aafd89 SHA-256: bb5ffa5c8dc1da254380c03b7a204a8116552a377aa814e289a8503f4cb76ae7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a phishing or malware distribution lure. The ClamAV detection and ML classifier further confirm its malicious nature, likely exploiting PDF vulnerabilities to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://huntic.ru/uplcv?utm_term=atividades+sobre+liga%C3%A7%C3%B5es+quimicas+9+ano PDF link annotation
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160902e961ef71---dojiletomerep.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/75476101492.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/90150518399.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/83048700175.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dbcc1612ba5---movutimo.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/84449357084.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/vagikoxirik.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4759265dc7---69598093304.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607127671c3e6---31603928037.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef8a2ca499---mojazik.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/35290608738.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/86738273830.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/bevikujajozoseruwera.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/9b71d2add81e64f0c852b0772169e1ad/18044639165.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/5d3f0ec7649ef0fb84e5dfc8e3a6e642/ginarekit.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/392e28c1f1a68f7ee540cd8446aa5f2a/torozuzaj.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210516015211.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tukapofarigudigavit.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/bovokowexexujegabo.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/77475534752.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/7r6h1qqmfnvss8jcunn1p97mcr/torugimidi.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f831a35886---retonumelakoja.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5180f2dd85---tanovovabipafekalevat.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/2963439064.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_off00010e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0E 11736 bytes
SHA-256: f9fb139bc6bf81c2f2ce11c6897ef212e227c3b6ec121b70a517b02f0d2241fc
font_01_sfnt_off000128fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FA 19708 bytes
SHA-256: f55f679fdb37150e6daf6124234321f6fca4d5cffbc371bb61ec3aa56f13f0a9
font_02_sfnt_off000158fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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