Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ed4703c5bbfd59…

MALICIOUS

PDF

84.0 KB Created: 2021-06-28 09:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 985fe1f4a25936874f820c3ca0762cc3 SHA-1: cd37a8bd591e7d6393742dcd8a4638b3faa99bba SHA-256: 76ed4703c5bbfd5916247dc18611242b5ea1df90b041d4c01756e498b2de3465
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were extracted, the structure and URL patterns are consistent with a phishing lure designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c7bd0c0cc---5754404280.pdf In PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/s6d7fr7chmelas0d2o16s2oc3j/88611825666.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/60erognnc15fmccjsche7kn7da/zalipuposoxow.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc5289a0f7---27075976109.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/komasedabob.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/46257973671.pdfIn PDF document text
    • http://hkalc.com/userfiles/20763134791.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/64898751179.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/likekivovavefanugaxepa.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a83a320cc25---1819623896.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/9ce24257427af064d0f29d633edbae42/50526389446.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/49737996708.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/u3fj3hqorqbsotvuqa66jju05a/piresofu.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/044a09d86724435e1aebc29374be1081/4503389519.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16086c3afd356f---3354496717.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/kezisadokuzevaz.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/e6045f531b63d59ac91caa5ebef8fcf5/76169179666.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/0703754e9e5cae48b1375da1cb281e63/7189630604.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/litutugulujawatejetuno.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6b0feb42d---34011277480.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/zuxokopupinusob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=chalfont+st+gilesPDF 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_off0000e5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D1 10424 bytes
SHA-256: 5996280fb0fc152dd16813853fdc9653f0753eee851d80242d54d16b00bf241f
font_01_sfnt_off0000fd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6C 17356 bytes
SHA-256: 4315a902286e539e5f5a8b0b6628bcb829c91d2e4bb91823413af1021d523199
font_02_sfnt_off00012b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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