Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e885f732959bab1…

MALICIOUS

PDF

76.6 KB Created: 2021-08-08 11:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 49c4a87caac778ef475c00ba8a60bb41 SHA-1: a1a6fc57382defa890abab33df9658f8c39afc14 SHA-256: 3e885f732959bab14a88c72aeeca156512152a1dff4696933798e730ad6c1f59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://infrive.ru/uplcv?utm_term=dj+song+zip+file+download+2018 PDF link annotation
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb5989b46e---wuxumosekat.pdfIn PDF document text
    • https://puntoagricoltura.it/file/72173591914.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/42762642624.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610394ac5fcf5---mifubuzijorizewo.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160873a75efac9---73579761259.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/150040229.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/91896178313.pdfIn PDF document text
    • http://atomleasing.ru/media/File/49164620287.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077f0c88722e---rojelitiwojejowifude.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/pejipam.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/luvaregudawosa.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/66236007540.pdfIn PDF document text
    • https://advik.net/userfiles/file/21594352041.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/a48auin30c1vjd0s32cat1onoo/zipaxuxip.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/b310e4addccddbc7bc8396ae02b00d06/64564134566.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210509023603.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/4cbeada0fb77882a086695f97c52c73a/mokivixumukorofip.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/25896693734.pdfIn PDF document text
    • http://sam-global.info/files/file/5838931351.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/u7qbl1vqbajj7stha73u101ot9/zugilijonatasitimesegojuj.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jadijoz.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/535667a07a72785ffc1fb9b2881fc187/wuzidaladufoxawudoxupanuz.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/54176388789.pdfIn PDF document text
    • 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_off0000c77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8F 16236 bytes
SHA-256: 6d9c1f4a81a4cd8fe4e74300cac06e2733ea40c545af4b927b205ba450a34833
font_02_sfnt_off0001098a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098A 11252 bytes
SHA-256: a587c68261c227ad8a79a4f01e5cbffcad9dac7060e98cd465ae56f54e2682df

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