Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a87d732c33334b…

MALICIOUS

PDF

129.8 KB Created: 2021-09-01 20:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 03511084c4d4cd471c0daa6ed14006c5 SHA-1: cd1dacd648567e7f3a97ad015d6b528b3bb54d9b SHA-256: 16a87d732c33334bb0878317842a43e84ba1980f0be252c20576c8d78557a0e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm or redirector to malicious sites. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and heuristic firings point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=batwoman+crossover+episodes PDF link annotation
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/01b239d02ee9d8201938a072a86861b9/julelafiguxuxixapug.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a3f1b0521---nigosapasofosi.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/14659695046.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b355d02708e---13423951919.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/4578ab092c7d5279bf73db5338106626/28235475665.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/69723546320.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/nabomoku.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/2fa25acdf160574db8ce4101cbcf1c39/58528869887.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/tewawimupil.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb9cb56d8b---wezinetatimuzokanato.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/pitisabebatuxew.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///banidun.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bc8578462---jogaxegolosokovodu.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2d08a8a3a---tikibutezefa.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/66441902320.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/menolonefowaruwimukuv.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/voxutamoguvozilanivedixa.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/pedoje.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcab4ae0d78---58275173481.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afc7389f657---tetunixa.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a70024d40a---janukugebosufulamaje.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/wozalozani.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/87076342860ff8fa645d3e.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_off000192c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001aad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAD5 20332 bytes
SHA-256: 995394ac815e595a89ca21d3a854581a7a56e29d93599e5aad8a40796d2b5bf3
font_02_sfnt_off0001dff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DFF4 10832 bytes
SHA-256: 23e91d5f49bfc76496d04729d4b12d9482de80c74d553ca66ca1588b7cd0615a

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