Malicious PDF — malware analysis report

Static analysis result for SHA-256 e09e1a1aea4ad79f…

MALICIOUS

PDF

85.8 KB Created: 2021-09-12 15:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc980442dafdeefeef4ac8d2f5b157ca SHA-1: 97948a53cde315d258a91518b7a21fd6d2c98b73 SHA-256: e09e1a1aea4ad79fe9412694e49dc333017259de1da4a6bcc3e77e840ab556e5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple external URLs, some hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The embedded JavaScript is likely responsible for initiating the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aaaxxion.info/images/file/90452580168.pdf In PDF document text
    • http://aven.su/userfiles/file/1047153639.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/14702442101.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/xisujixiledu.pdfIn PDF document text
    • http://oasishs.com/uploads/files/20210907_162006.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/2305688457e003cd8e6368493897f134/matubebowedanasen.pdfIn PDF document text
    • https://akemi.ro/hirek/file/fujiweta.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/nifukewulovad.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/b124aa7dfb55cceb8f8866575e93cbd9/kidamudemitusatokifaxe.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/fizaragogubexalakalemat.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/mefugowotijar.pdfIn PDF document text
    • http://agama-rc.com/upload/files/lorodosomaromemotugajar.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/16881863920.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/88873612470.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/74593739340.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/wunimujabebopani.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/jiruw.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5408baf7c---86136888250.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/85582383669.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/detuwizikivewarujixixe.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/79650359293.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/karifov.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210902093414171.pdfIn PDF document text
    • https://rippa.pt/files/file/33271534023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=describing+translations+worksheetPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC10 17368 bytes
SHA-256: ffed26cf2f75241ab30d82d4f53e7d48cce20d8d54fb62a368c33db45b00e1c7
font_02_sfnt_off000118e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E0 10828 bytes
SHA-256: 167cc38a50f0ff08c7d10fb624122c682e50f3a6952cafa7d527fa0f341ade24
font_03_sfnt_off000131e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E6 16496 bytes
SHA-256: 1e6ea4b64e2d9bbc6a60d0b738bfd2a077c94e99ec46a0c646697b2cb45da6cf

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