Malicious PDF — malware analysis report

Static analysis result for SHA-256 5734b2adc91c0eb4…

MALICIOUS

PDF

83.4 KB Created: 2021-07-17 07:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 50904184048d2ea0d0acc9ca7da88d36 SHA-1: 586bc4f556974008104e297caf621e25645f280a SHA-256: 5734b2adc91c0eb4cd86a18e7d615fb6136b2366ffbb5031c043a3dd865cbc25
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bcec4fd6d---41427920846.pdf In PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/t15a2bpa6tlvro6vtg54qrc79l/67614988768.pdfIn PDF document text
    • https://cristalensi.com/public/File/950020055.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/66736422854.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/41154473128.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/77026187210.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/fobojirijo.pdfIn PDF document text
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/42963411735.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210605222126.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/65072157775.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/sesebakusenovesowamonam.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/suzud.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e5f2894c6---jilozudesokujimu.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/dipuvi.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/nesuvuvor.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160947b1fa5f3a---limorufojajavox.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/9807431036.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c368e70a---ruzojo.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/b0fa6ca9b10be3f4e4cf6a568ff855b4/74291825561.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/mepizesutebenaxovu.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160811635b6ae3---zapadafe.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/0l4hjp88ph0g5ijg2l2ged7bam/razugumizolivexaloguduzek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=representing+motion+physics+answersPDF 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_off0000e238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE238 16964 bytes
SHA-256: 505f9efadca1553feda228dee724e8a6ed9e95219c0ba1a331712344344f75a9
font_01_sfnt_off00010eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C5 11020 bytes
SHA-256: 49e574d769a43f9a51ee56dfbe195a6c2146aeb5c984a57a574b3e6c23f871a7

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