Malicious PDF — malware analysis report

Static analysis result for SHA-256 e560a061b44b28b6…

MALICIOUS

PDF

79.6 KB Created: 2021-09-07 14:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0acd56ee458760fd455fec65e4cdc070 SHA-1: c1960b8b8e626f78dd2eb13b3dea3ed049e47405 SHA-256: e560a061b44b28b6f04972ee344748cffcab811ed13565d25026bcf5b907f338
164 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on multiple compromised websites, indicated by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a secondary payload. The presence of external URIs and a download button lure further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://llsindia.in/FCKeditor/file/pabak.pdf In PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610cd05e6063c---wafazoronovonumokasofa.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021618525353777.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/18150336888.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/98928054414.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021061105055473499.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609450da2cbdc---jepokulakurofafij.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/0326dcba29feb299efdf7be7be0f77a0/26986161293.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/77284178532.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609de658d6098---wiwigivibufugezonovemese.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbd1b4c0d7---kebuxuvelujapupudu.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/zipibixizadegaxireg.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/gopevanobobiseradevoke.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/66059652823.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/ratuwelakusadapafako.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/7ca1a8c0fcf38d878a938f3263ef2509/nedurosukukanabi.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/slqjuicl3mbtofng41rhl109it/karotosuw.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/ratojotexojedamegakiki.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/nujipemisev.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e8dbbd2ac---42752205305.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/45417344749.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e28b7a95---14816954354.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/jeragoside.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/70217749094.pdfIn PDF document text
    • http://xtra360.net/campannas/file/85640556830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=pdf+printer+for+ipad+free+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_off0000d4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A2 16876 bytes
SHA-256: 82d84bde22006a646fc5b3c6de2cb1efd2a73f832f2742c1acc04d5daf7ed2d6
font_01_sfnt_off00010080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10080 10408 bytes
SHA-256: acf510066e1213e7227fa8d20f4e2be73094d9670e5fda869db88c5fefe63be1
font_02_sfnt_off0001182b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1