Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb9156a5c4eca4d…

MALICIOUS

PDF

101.6 KB Created: 2021-08-13 19:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 64f0b5652bc27749ee52dff6e0dbe785 SHA-1: 26ea282e97c922dd321796b84e9800d5e2448dbd SHA-256: 5fb9156a5c4eca4dddedf9c7eb0b4f939dfe410c503ffe1a1d538d7393c800ba
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads, suggesting it's designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves directing users to external, potentially compromised sites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a4d347c3c---pivojinenenopigeputi.pdf In PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/7362ngjcaml76mb6kj0h9jjlr2/zejenilelemozegidizinos.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/58711554726.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/7889b5c1051601c395e9cf2ec29cdf3e/11241432886.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1ac3c14f3---pilute.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/77605345236.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/902b4ca18f599e183b41684e9ea576ce/70121120586.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e633a32a2---zebulaju.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079ee8473dbf---rimar.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/tutaverami.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a57eab69d8---zujakofirasovujubax.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/mifexok.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/987239283.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/99511416480.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4bd0cbe6f---wamimiwesizusitefinot.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/v6dp2s7lrilr6ge3h26qhkoqls/4676936587.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607421e49e208---18573492789.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/42394315565.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/2863034510.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/kajevidixenizolokelov.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/gorobir.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/12031176072.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883ae16ad08---27052549642.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/vubapotudixubeto.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/jowuduketigufinapepaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=an+introduction+to+sociolinguistics+janet+holmes+pdf+downloadPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12631 11364 bytes
SHA-256: 49f83dc02d96ef7cb016cdd75267b3ea33858b002c3954f582b1e0f429b7ab53
font_02_sfnt_off0001409e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1409E 17984 bytes
SHA-256: b18108d9674b8e6d85cf25ae5130f0bf6482e4cec6639b13f35a4e740e72843e
font_03_sfnt_off00016f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F6B 16748 bytes
SHA-256: 4014d1afa0ac63ec63aaf26f1ffa4ecac63bb533e2cb732938dcab386eac4e63

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