Malicious PDF — malware analysis report

Static analysis result for SHA-256 9674fe4be1b0c348…

MALICIOUS

PDF

76.7 KB Created: 2021-09-01 19:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 38ec77c864a84f411e98df50a10410ec SHA-1: 13eb855cbbfcc30f81ec12c1adb0026936834665 SHA-256: 9674fe4be1b0c348d6074ab3151a2b911006a516174bf9cf989881c28f47e0ee
112 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads, suggesting an attempt to deliver a secondary payload or redirect users to malicious sites. The ML classifier strongly indicates malicious intent. The presence of PDF_JS and PDF_URI heuristics, along with the ML_NYX_PDF_MALICIOUS firing, confirms the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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://huntic.ru/uplcv?utm_term=apiary+management+pdf PDF link annotation
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/f0a1103c0a03021b8b0dcf2c9b021252/29085416877.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/10893174767.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/67761501876.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/rupiwugomojifozu.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210807031029.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/nifexitevozopo.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/e2398f2e857a83bc1074defe17a1119d/wikisanowujed.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/detoloxukapepulab.pdfIn PDF document text
    • http://parfumkin.ru/files/files/75716643446.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a44497bd5c---6826776583.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f6e6b5986---57489741774.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/75402477216.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/cf864c73a70353f47eb46366c209d509/45509649635.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/31244678773.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7aa7d92ec4---ximinexexamera.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/447e6607280f48e9a00919d90ce99460/73747391167.pdfIn PDF document text
    • https://medbioplast.com/klucharnet/images/file/58380229118.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/46477489584.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/sujezudesemorazir.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/nowikes.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84632034f7---11138395212.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/96718232626.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kibupikalemenijefaduru.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202108180419057850.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/3573500875.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_off0000c822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC822 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE039 10600 bytes
SHA-256: 6b518d3607485be2e24fcc6b8c682268a469dba6ef8b1ca20cc7a3f3f108c404
font_02_sfnt_off0000f83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83F 17644 bytes
SHA-256: fee554c768673e72cab5d8b364f62d2c5301b403b9d0f3ba1bfe0b1e5df5b1cc

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