Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f7cba12b77eb64f…

MALICIOUS

PDF

82.5 KB Created: 2021-09-09 13:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: decbe027f7041f33dcc8083a61402a86 SHA-1: 5ac49c7b7ad0caf24a62f162a4c5874cf4c55f14 SHA-256: 2f7cba12b77eb64f5534ef41c760334a5eaaf01b06b3e3c18e7c9531baa1136f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting sites. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript execution to redirect users, hence the inclusion of T1059.007. The primary attack pattern is likely to trick users into downloading further malicious content via these links, fitting the profile of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://huarui-bio.com/upload/files/60418377764.pdf In PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/f2005045d361615010763d8dfa2d9c8f/78209843532.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612fedfa5aa6d---55013574117.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161374ae54e18e---41136991211.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/domeku.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/pogafirab.pdfIn PDF document text
    • http://ebus.cn/up_file/file/98916834953.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/ginanafexakeputulewagolak.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/bojimileseleso.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/34395210778.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/65358310563.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/vitawuxexem.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/ee2d0df3fbe4fc5679537c85efa7b366/42481827958.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/xupakoba.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/nemodasuzigaz.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/pegadixitokiwasov.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/20244713223.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/92740520671.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/34254598476.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/zaduberikoxelo.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/a2eb9e470c042725c6b2e68c9f5273a0/lopopisujo.pdfIn PDF document text
    • http://keitbg.com/images/files/17065879096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pokemon+x+3ds+rom+download+for+androidPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/basekoloseparikabunog.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_off0000dc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF442 10872 bytes
SHA-256: f16d069fb7291f5c0b31ed4b25c8597c133bae6f069adfa89c1ff8f002298ba9
font_02_sfnt_off00010d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6C 18112 bytes
SHA-256: ad6a979bbfcbae1e1f9b4a52a29a7bc65085032a3327c246bde68934b908fe81

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