Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c955528520459a9…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 01:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d86f5c1e1496d30f03fab9aeaa88e667 SHA-1: 9a8fe2b3d9cd145b8cea6cdfcb1bd96d4f625e1c SHA-256: 1c955528520459a9cf754c58dcba53e5935247b68ac39bcf62055fe775bee275
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites hosting other PDF files. This behavior is indicative of a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pixomot.ru/uplcv?utm_term=surface+chemistry+important+questions+pdf PDF link annotation
    • http://malifer.hu/upload/file/731800495.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/ede32a38e13b960562ffaca4712f427f/69118368649.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/469eb4a4d66875db05baa5019efb61d6/79205934882.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-8-19/20210819030415267218.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609f776be1dff---pidifiruvolorul.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ca6838d5e---muzororos.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210503122134783558632.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/xagulegebupe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105f9414f81c---lizoxesigezakamagukubaxi.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/vapimegetejoturub.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/jomudulelivuvexux.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/wafatupogipetekulinurit.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dd77ef80f42---xevilozos.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/gijalukonisuboridafake.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/rksrkfmnhbsdrh3th47gh5ksp8/42061141061.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/c0d3566c507284932c1a058f0468ed0d/32540077192.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1a7a07107---jujimi.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/rigolovibolo.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807edcb156c---63315613038.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/lewowulopofinogadilajixo.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/e7696644e612b7b2423075cd56f2b5cd/gekinudimege.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/nepejemigijujagudasiw.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/90552129716.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_off0000cf9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9C 11276 bytes
SHA-256: 80fe90965d06f1e3d962acb69289484207e09ac27d19bd977316fba5d40f3a16
font_01_sfnt_off0000e9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B6 18672 bytes
SHA-256: f19b0ded5c332fa7e26154d8427130f39d898248e85fe2b8b817f10914bcb705
font_02_sfnt_off000119bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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