Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dd92a0916ae0dd3…

MALICIOUS

PDF

87.0 KB Created: 2021-07-01 18:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1fb4bcca5f51001d03ac7c6a8c1b1d2a SHA-1: c84ab6fb26fd6c24254d40a8e6394fd58c081b03 SHA-256: 6dd92a0916ae0dd30a8a24df8048c958c21cb1f093d26e9c5eb244433c8fdf4f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 http://sgrappresentanze.eu/userfiles/files/80136487822.pdf In PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2d85b5a05---15074044118.pdfIn macro / runtime command snippet
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/d8piucreiodt5lv5ohoccl2cat/buxugokabebugeb.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7884b2c071---bolizoravazix.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/54849543591.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/25e1c50d47cd676151836cd2884c1fe0/1933134385.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/xedufewabibugifufibavova.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/nibeduw.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/81092151529.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/a9759c580b2fbfe310b0f87c1b3bd828/kefagewukogafogurubax.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a6836932679147e82a75c08bfdca367d/82889141221.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/jigexewodiviw.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/42ef7dd4a700de59761a83cbfdb932b1/xilim.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/336ab4b61cdc709d05ce1b58d84f0da8/repedezotupamerofotele.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/31ee75b0cc31537abf070955a318131e/kiwuvedegafogijevinixuner.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/98763499425.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/xopigexezuxujuwubupenemu.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/5159c28e38453036cf6cef709f57521f/46041032989.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/nakokobesupugoxutumesigaw.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/24933248193.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/e053361750f1edf555aeafc185988c1e/namunipovijas.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/25308918180.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/sajomurolete.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/gorakotuf.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b317168ad1---22420035547.pdfIn PDF document text
    • http://sgrappresentaIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=murray+river+curly+coated+retriever+puppies+for+salePDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/98624299195.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_off0000f076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF076 17024 bytes
SHA-256: 6b8b8a91dd55472b0a9ace8e6bada0e4305a2f8398587e83352bf519f547e15f
font_01_sfnt_off00011d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001351d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351D 10784 bytes
SHA-256: 2e638ebc579389b6e093d850481ca25b1f98bbd0fc1cb984c0b0fee743c3a272

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