Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd2d7dff73462581…

MALICIOUS

PDF

120.5 KB Created: 2021-08-31 14:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 55d9ae583b9c89c1daf6d9f070e39b85 SHA-1: 89c395be83f96cb0b5ac0f9ed475156138b16d34 SHA-256: dd2d7dff7346258194bc82d6b32a85e0f12e463415ea1144af148b365cb928f5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to external sites, many of which are hosted on compromised WordPress upload directories. This suggests the PDF is designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a205acbe037---53674181763.pdf In PDF document text
    • http://js-space.de/userfiles/file/zusidonosuxoxitemak.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021071617350185.pdfIn PDF document text
    • http://decorstore.eu/upload/file/wumemabomavoge.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/513426a7fad56116122ccd3ba8845113/69941127838.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/0e9fff2337c2f0038abcad0818f53292/lojujeliwimijono.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941d89c7b08---wepidolarozipafizo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608970c4ec676---30696289410.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16108a616c9852---44446648406.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8e1b87f6cc0874dbfa6c08a9762cf0ce/vinutigawafurasipuk.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/2a56be50f59c5a101b22653b49a1d66f/moretunoxudururawumitilal.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/wejugebilelobapinane.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/bofiwifufimiw.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/96362496374.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7f4087374---82282754640.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/73462577897.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/vatavofutibof.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/jakupijupasimeruwom.pdfIn PDF document text
    • http://puppiesjust4u.com/clients/c/c8/c8a8d0e690f73854b1e7a5fbb9521f82/File/80728135079.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804eb7f0249---nosexa.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/nowagimusezorazifiwekite.pdfIn PDF document text
    • https://masihpt1.com/contents//files/86242776903.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=a+well+labelled+diagram+of+a+houseflyPDF 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_off00016a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A65 20620 bytes
SHA-256: cdf7210eda9f98a63721825ab12313d5ceb645892096923686a47c0a8b25c0ba
font_01_sfnt_off0001a067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B87E 11020 bytes
SHA-256: f021c9492280decb30fb9a4cc822dc974262924a51616301cc9e51ac84e156f9

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