Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92008f5d0cf98d4…

MALICIOUS

PDF

80.7 KB Created: 2021-09-11 03:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 399cbf5eb60bb02e98eff4a56b9a36d0 SHA-1: 004bfa83fbea21826296e156a31fbec272a2c267 SHA-256: f92008f5d0cf98d40ac6b25c09e215faffce8258670edc389c8118bb55bcacd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as a link farm and a potential phishing or malware distribution vector. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, particularly those hosted on compromised CMS uploads or disposable domains, reinforce the assessment that this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://menlopark.com/wysiwygfiles/file/20725162009.pdf In PDF document text
    • https://hsiaoying.com/userfiles/file/46151327063.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/berapixuki.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/46969275754.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303d6450749---71702504320.pdfIn PDF document text
    • https://nexapos.com/upload/files/sivelixabajon.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/66356411039.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/67b4bcbd4b3fffbc99e0f330aacfac4c/62124347915.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/75272170293.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/59460638981.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dakisorajixotafos.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/diliwixoberewedaxazode.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/091889b940fe13e413194dd0f16f4af5/37174949767.pdfIn PDF document text
    • http://builderall.info/userfiles/file/3765752964.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/16482075542.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/jafof.pdfIn PDF document text
    • http://ecole.ru/text/images/file/putifux.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613457e5ecb67---84051346049.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139da262865b---gapulag.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/kenadudagidofozed.pdfIn PDF document text
    • http://scsychem.com/upload/files/zaganubuvonibowosol.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/14144251664.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/rivexupasebotowudavi.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/duxef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=do+iphone+emojis+show+up+on+androidPDF 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_off0000d570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD570 10828 bytes
SHA-256: 994500b6ef490beaddac4942179611b4258e16a22bde5712d8174bbcf4f882af
font_01_sfnt_off0000ee33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10645 18028 bytes
SHA-256: 8ca3e92c73bfe1cda3ca72b878cb6338dabe40ddea843431f51a9856cee7daeb

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