Malicious PDF — malware analysis report

Static analysis result for SHA-256 777b4f8f436ced3a…

MALICIOUS

PDF

119.6 KB Created: 2021-07-03 14:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3a0c7fddd62802b204d1e42c4fef9ee0 SHA-1: afc8206d1779ae04be3259572b9ffd53809681d5 SHA-256: 777b4f8f436ced3a027b559768b06f75423714b83a41487742e078481ae5a703
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://hubbardfamilycircle.com/clients/62940/File/zidoxesaxokeraja.pdf In PDF document text
    • http://agiteam.org/clients/b/b0/b0c4817036ef1cb73596cc935f3fa86d/File/lixizeduzupaz.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078484642aaa---lonakudixatadikelinux.pdfIn PDF document text
    • http://antae.be/app/webroot/uploads/file/figasaposumironozavigus.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/80a153d4f741f815ed3de9646b0ffe8d/puwipera.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/efb40d8e80a6bf54c1829f454e828e8c/18428177613.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/1df16c8ff140193ddc9321281ebc6d04/lakuliwilo.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c248f04f028---gazatikuleve.pdfIn PDF document text
    • http://falerisztika.hu/tmp/47620953580.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607641222c8d9---tojemekijuvuwajer.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/64584001791.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b552b151a0---fiwataribipomebepeve.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b84d78aa263---xesudek.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/3qdp31pq048r1p6iqng8vbdjmj/41539020942.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c06a693370---xusoguxad.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/gelesovikivuroboniwesebe.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfda1b05891---20995073932.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/1414641937.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/68369295349.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ojmqia0tg961c0dhuuc1lt6qe/19542665593.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/xubekolibapena.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/58764580393.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9e8a978c4---60340517006.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/60876782075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+hunger+games+mockingjay+part+1+full+movie+downloadPDF 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_off00016c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C58 11672 bytes
SHA-256: f1a9d4f4cb47ea1d5ef0b2b968cdf132d84c7ff5c4692e6f9902752728f98cb9
font_01_sfnt_off000187d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FEA 18824 bytes
SHA-256: 98d2f4b5e2edea0bfee29f3304926d4cdc4c54f411fb4d777a66736cb0ab1af4

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