Malicious PDF — malware analysis report

Static analysis result for SHA-256 4984121bb2c0f51c…

MALICIOUS

PDF

77.0 KB Created: 2021-09-07 08:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 16030d834101cf1e1adc17e4b084a60f SHA-1: 7c7b87a1dadd3b4b60663b7fde03ec7751bbd497 SHA-256: 4984121bb2c0f51c107f70d0e80f1fd2097b45cad24efb5a056cc34c02ddb120
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to lure victims to sites that may host further malicious content or phishing forms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://smidgel.ru/uplcv?utm_term=orion+lost+vape+instruction+manual PDF link annotation
    • https://kuepancong.com/contents/files/68667891084.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/91020800651.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/05053ea4f12cecd90133cf2d8a0be9d1/xaralijepimosipumazut.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/balelujerekafukug.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/f12d12a8f8097bd2f456a6e65204334c/62287593217.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210807_102752.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/fevuvuzujijadutefinugirum.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160f87c84ec5ce---gositalabaxebevepi.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072a6628df59---buwizisopumevedotoseti.pdfIn PDF document text
    • http://dzbnf.com/upload/file///9621937545.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d7c1ad28e---fokelugikik.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/sakanumusiwikideser.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/lenepuxif.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/95939012715.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/gofubugivubesijalez.pdfIn PDF document text
    • https://termofriz.rs//files/64658416631.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/boverebilu.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27314611b3---padugenola.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd287013b1---50931630451.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/95422422853.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210801145322.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109030309584114.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16071d4082565b---gigetepimofugewozoredo.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/dugekopededafoxezupe.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fec071aee2---36522844563.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/a214fb62330db3df1874089052108b56/popobuvoberugafub.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/jazarimidesoxijuwof.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_off0000c763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC763 17820 bytes
SHA-256: 4e5911d10531308374d2118447a8c729994def1b7536ced072e881d968cc1051
font_01_sfnt_off0000f56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56E 10724 bytes
SHA-256: f113761a10f108e0a5bbe8a6616be6349ce2bfc4abe2b0c33f462f14df931a03
font_02_sfnt_off00010e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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