Malicious PDF — malware analysis report

Static analysis result for SHA-256 6533805d6177a5df…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 11:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 35eb91cfbd07a0af5ffe2d2b325796f8 SHA-1: 4744b75aa560c0b450e42801acd846651783717f SHA-256: 6533805d6177a5df0681dd1b77398936c6f95cbbe8694f374e5d52f006e47a5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/bb388bd27adeed610a30f36cbb9f409e/57835866148.pdf In PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/06oo6aqvaf5eg6diq28m7lb6pj/dosukitagunoxobepijew.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/dafijalidavodesadejaziw.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074a35b79960---figoti.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/74956479589.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/92175034741.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/baromawefonetaxunoxeletus.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1c3fedfa1---ralevuve.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/labuxuxorozirisu.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160af7a8b3ab1d---72365830905.pdfIn PDF document text
    • http://acril.ru/ufiles/files/jisipebawuru.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/76987907004.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/bokuwupixokitukob.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/5e22d5c425b22cda7d036e179957ce98/85693035227.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/30807724332.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a43954ca4d8---19135773850.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/fixegogiwek.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/805c0e934a4122c3f790b2154ebdd298/pulavenilixejop.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/7990231933.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/pupobagifomasusoror.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160885c09aa6ed---65960042157.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/24805106245.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=alliteration+worksheet+grade+3PDF 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_off0000dc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC89 10860 bytes
SHA-256: 506bde1bb451e60f6e0e9b9952b399cffcbba98205335c2ba1b1cc447ee2ea2d
font_01_sfnt_off0000f577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D89 17972 bytes
SHA-256: 1c5960fc0bff65b2c5b073d287026e97fdbf85f7cf776fc45e0ccc75f50ae86d

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