Malicious PDF — malware analysis report

Static analysis result for SHA-256 990eb6a7917a826b…

MALICIOUS

PDF

108.3 KB Created: 2021-07-28 03:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3e7a6dbc98d86a7c91a8ca0c7f641dc3 SHA-1: f79928763171e61d534ed0b7d5729aab31bd5b1f SHA-256: 990eb6a7917a826bc90ca1d76451a2eb50589cd1d7fb90bddb446bd4c113a667
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm designed to distribute malware or phish users. The presence of a 'download button' heuristic and the ML classifier flagging it as malicious further support this. The ClamAV detection confirms its malicious nature, specifically identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9634

Heuristics 7

  • 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.
  • 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://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ihfmjlq9ofnc38ak8c1e0k0njv/nalezatufupipodalab.pdf In PDF document text
    • http://ei-windykacja.pl/upload/file/titoselimoberunuteru.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/33084924269.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/nasagirumazunim.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080b412b19c2---87097993746.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/64f9e335da66593d4c6b10a8f4a359ba/2859847073.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebe9b7e43d---sejavogojadenipexike.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/gosawizuvaxujojiv.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/48555387117.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/kusowisomizelade.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/81902039048.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/poss0gfolthugm3jlot4sb9v77/jomuxaboxofimevipavuneke.pdfIn PDF document text
    • http://drironcat.com/images/file/65662994652.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/e10a795d3e81820884b4b34edb595843/36015451899.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/5987035135.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/38108033469.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/jojawaroraxubakav.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a7934146a---letilisekaxuxazujaluvojos.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/49826958801.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/61403531812.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc78b19620c---zobabomufolajexe.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/napuvadotikupuxigasubaxa.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/o773i79v3if1a7jh34h0dq46o9/48131841929.pdfIn PDF document text
    • https://ive-cal.it/file/vulukitawelukukowu.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/1672af07b251ccd52aa565551d461a10/9659114153.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/60487063838.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/c53c110e316447cb7c7086cb082f5646/53713319773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=minecraft+pe+13.0+free+download+ios+no+jailbreak+2020PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001389d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389D 11584 bytes
SHA-256: cb73c4fde7714d4a62584f6b919d2f4da4882d97bf8beffa6796890749f54930
font_02_sfnt_off0001541e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1541E 16704 bytes
SHA-256: f3a20dd5e700ae390a0fe49f1c8ffa79b3fb96a0bd172bb38c6ac14fcf60674b
font_03_sfnt_off00016ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AB3 17616 bytes
SHA-256: c147cdfdde8ece3d0684804784921ca42c98d6ceec3bef41b95a70486d55af6d
font_04_sfnt_off000198ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198EC 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13

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