Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ae85b1b2ed59b95…

MALICIOUS

PDF

84.7 KB Created: 2021-08-16 17:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 28178ab7d7ae1887e43247db867d5b74 SHA-1: abd8a7d9bd4ff577a488b9641ea4f7696c0e229e SHA-256: 1ae85b1b2ed59b95305b559403899e3d1ec581e9f3910e25c1058e7107e5158f
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, many of which are hosted on compromised websites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or lead users to phishing sites. The presence of numerous links to PDF files on various domains suggests an attempt to distribute malware or facilitate phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jatyn.cn/upfiles/202105/file/1620464525.pdf In PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/5a15f86173034367925ab2af43b17d0d/21977918445.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/putifapib.pdfIn PDF document text
    • http://xinyuemu.net/assets/202106/files/20210605134717379424.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/zaxubedotani.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/83337826734.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/9575445087.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/62005087.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/fufunizalotinalixujekinu.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/jugelisepivirawelat.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc9fab4e66---powojobuvupugamunenopema.pdfIn PDF document text
    • https://ms01bet.com/contents//files/99897266829.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/wuwabisoparagipumuji.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/29652611848.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f94820adc1---11232724898.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/52bbb3e830a9df286b7becadc1c67c51/dufubiwenekoruf.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/57900820098.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/61159498832.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f70c16246---buxazemijuruwet.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/cf2df0209227b9a5c9e6c71ac7d6121c/37899839196.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/9fc4017881eadcdb59a4f4f8120d364f/nisugax.pdfIn PDF document text
    • http://omg50yrs.com/clients/6/6d/6dc66c997efb3e4e8ce6e6e7d0694e91/File/tesunurijuvej.pdfIn PDF document text
    • https://unitjaya.com/contents//files/retoduvevesuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=operations+management+william+stevenson+13th+editionPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA54 11240 bytes
SHA-256: bbafd9e786b9f2c5fab6aec7e523768d612b268c33ccad329f92a8826ab35a7f
font_01_sfnt_off0000f467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF467 17240 bytes
SHA-256: f5ee4535ce0be1540f1e10402134dfee79c6906af8745bebe1f422df4914cb8f
font_02_sfnt_off00012189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13996 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8

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