Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8276ce55aee665…

MALICIOUS

PDF

97.7 KB Created: 2021-09-12 11:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: af4d4d0ee83ab5fe3c75c665f5929830 SHA-1: a3c4bc8ddb36d7d46179c6300d5957039a329f45 SHA-256: 6b8276ce55aee6655d3168d630211302afed0c58b58c994fd1ffa1591dabb4f5
196 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_LOLBIN_RUN_COMMAND' indicates the presence of command-line tokens within the document text, further supporting malicious intent. While no scripts were explicitly extracted, the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://philabc.ru/uplcv?utm_term=howl%27s+moving+castle+read+online PDF link annotation
    • http://solarissoft.com/img/userfiles/files/19548566090.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/tazivodaw.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/40435153046.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/lalip.pdfIn PDF document text
    • http://qdcmd.com/data/files/buwiwidedibozizigalu.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/48791549493.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/60625508628.pdfIn macro / runtime command snippet
    • http://mfahk.com/upload/files/xaxekaferapedasonudon.pdfIn macro / runtime command snippet
    • http://photo-ostrov.com/ckfinder/userfiles/files/61264864947.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/guwatirupinevorozapegibob.pdfIn PDF document text
    • http://amatnieks.lv/pictures/image/kevabidedatovexowugula.pdfIn PDF document text
    • http://www.bash.cl/media/file/lumitoxigukal.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/07090411699.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/80881068342.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161322e890317b---69656886741.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/nujisilu.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/53187894017.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7066c2918---23196480023.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/neluju.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/liziraw.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/61359acda9bb0.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/somixavu.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613919f6101e3---40938740749.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/rnc2e1v0gng2bu2q5lop141sbs/xazijefawofokugi.pdfIn PDF document text
    • http://xn--80aidIn macro / runtime command snippet
    • 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_off0001087d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087D 24156 bytes
SHA-256: 9849c679e12907e43dec39ae04cdc9905217b09c95911beae47304ea2cf17116
font_01_sfnt_off00014789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14789 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FA0 10888 bytes
SHA-256: 68641bc01a1f42910a682eca8871d87242fa672a3b6a43a5e3d6b0dc960c2c93

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