Malicious PDF — malware analysis report

Static analysis result for SHA-256 87bea8e19c190698…

MALICIOUS

PDF

80.7 KB Created: 2021-09-10 10:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 166498960828a77c94bd5d60b140f1e8 SHA-1: 5d92c41975d46e30f11af4a2ef28f17a8d23e443 SHA-256: 87bea8e19c1906983b900b6d8660c7d2097f0039a0c221ad77c23434c7a6efb5
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It presents a link farm with multiple URLs pointing to PDFs hosted on various domains, some of which appear to be compromised WordPress sites. The presence of a 'download button' heuristic suggests a lure to download further malicious content, likely a phishing or malware payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pasifikendustriyel.com/userfiles/file/wovonok.pdf In PDF document text
    • http://reclameindex.nl/images/uploads/83046270581.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/oe0mm5k32u18jmp9o3enr8tpf1/gewolurunuwu.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/sajagederese.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312d50d3f6b---xiwifagu.pdfIn PDF document text
    • https://topupdana.com/contents/files/4260115245.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/rakivujex.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/9ftbkjuld5ni2utreqgg3bjq86/87259214920.pdfIn PDF document text
    • http://njchemland.com/upload/files/26804120792.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/pijuv.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/zojelesonapopasadogetok.pdfIn PDF document text
    • http://nscenter.cn/upload/files/lotoduxatum.pdfIn PDF document text
    • http://bociany.sk/media/file/56426596457.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/98739657011.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/a72ad3acec1d6f9c3f54b82fa59bb664/26620279347.pdfIn PDF document text
    • https://tempegaring.com/contents/files/26981685429.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/vunalopamewu.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/66547404238.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/nofeluronipuzewukokizew.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/3e664a14043ae2b06e6d7db8fe7c277d/99358220563.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/c8ftn9n8atctvra7m43nk7hhje/2097132839.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/97359812936.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/23508941042.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/19297488836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=android+auto+wireless+apk+downloadPDF 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_off0000d522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD522 10644 bytes
SHA-256: 2886424b23ba31d5c7c85022249bdaffe8daf575931d8974b44a4065903fb8b0
font_01_sfnt_off0000edb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C5 18272 bytes
SHA-256: 65d15907ead3167435bc31cce9553e0f3fb2ea07e4701cfc17cd94d2e80f416f

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