Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1095271cd0e124…

MALICIOUS

PDF

76.6 KB Created: 2021-09-08 10:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 64a5b467a243a99743f0a3f848a632cb SHA-1: f9211f9dab11639700457f3862cb4cf0cc38dc3b SHA-256: ca1095271cd0e12475b062a6dca0012717e29b3b647ad4c847f07e063a4260dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to obscure the ultimate destination and evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a23aa4c71c0---fakivovugiruwafat.pdf In PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/zivipepaz.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/99e31cfdccc373f211af3ec3d2dbf0b8/lixarokij.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/wuzaxozikites.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/paladirekemonodudilovake.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/av7lng3fvb9spl35qps1sj7tb0/68098268180.pdfIn PDF document text
    • https://podimercrm.com/img/files/gotikimogosebupu.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/fanupopugerofulexivujo.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608637ab0f288---53984233447.pdfIn PDF document text
    • http://mcelvain2020reunion.com/clients/b/b5/b5167212b805812c9439186484f80f5e/File/vagokerakilak.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba91be7018---59370548619.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/tilidab.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/0a218d7205fc0f0483515018f7a84f9d/dazatefekimo.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/31682972199.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///bazebajivu.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/45897217862.pdfIn PDF document text
    • https://ekaplast.site/admin/ckfinder/userfiles/files/sejop.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16111cbab038d8---50265184933.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/24863426185.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07c7ee363f---kuxomizad.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/beverimufuvo.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/91275437678.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/98147655927.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/kk3934meie9vpr86rp8hk8rn6q/navuxewu.pdfIn PDF document text
    • http://ridendo.cz/files/file/relizoxuvod.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/lubemomazadepaw.pdfIn PDF document text
    • http://ypdtools.com/ckfinder/images_store/files/toxexelixeninag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=year+planner+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30C 19412 bytes
SHA-256: e7f74957f93f703c0b1c06d708bec97416a595d84c42a68d925309a0de5c79b0
font_01_sfnt_off0000f54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 10200 bytes
SHA-256: 59719af480e9d2ce11871a75142e97aefaa74bd57a70cb9ab3d1f3914337b7b6
font_02_sfnt_off00010c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1