Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5e522938e58f83…

MALICIOUS

PDF

84.7 KB Created: 2021-08-21 02:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a9983f72a76b29aefd2f346e4c8bc2ee SHA-1: 726c2cd03c014b2aaf4ba684f83cbabe27cf6d51 SHA-256: 3b5e522938e58f83d6db62d57c8b3ef287271c55e12a225e8514fd4c0082d11c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing or malware delivery technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://drafthe.ru/uplcv?utm_term=exercices+interactions+fondamentales+1ere+s PDF link annotation
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989122d47e5---28322236948.pdfIn PDF document text
    • http://abwrva.com/uploads/files/sezosagugex.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/jademasasajegifidozo.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a654327429f---6848853727.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/b8efb436c0502c11657f2dd3d8dea0d4/tixorok.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/83918057000.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a1bb96f81---gerarevotowanav.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/de6343359ec02b634067ccc83888d109/farovanatosa.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/vabixopewo.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/129ac605183476d4650f96833b732c9d/25793652253.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160727b0d8d63c---luzesifozojefipapuf.pdfIn PDF document text
    • https://stopserv.ru/files/file/22847501455.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160885f50651bf---wejatokatesuw.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/55251916145.pdfIn PDF document text
    • http://juha.be/_files/file/7617981533.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ffb16c868---73767924678.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773ccec9b24---wiloza.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/wejexofedomunimanefomof.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f13f36880---wukalas.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/mibexujibedoluwefafavef.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/mirirogorifagen.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/19208252257.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160adb7f548053---tesivumavojizugipufig.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/wizujuwewonuvev.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160738257489e9---64867547045.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_off0000e18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18B 18964 bytes
SHA-256: b1d59fd6cb89df46721ea1047192e6fe53c91deede5b5cad467b2e0982aa5bff
font_01_sfnt_off00011136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11136 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001294d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294D 10776 bytes
SHA-256: d69ef592e7a776e4c3acc42638ba5d24395b144d07b8e6a2402fec5b5fca6f9d

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