Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3a7e16badeb4d2…

MALICIOUS

PDF

81.8 KB Created: 2021-07-22 23:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9343342cf14dce9848906f1b4a8edb61 SHA-1: b822bc9f41c271549fb476bdb235e1cb6c42150a SHA-256: 1a3a7e16badeb4d2abf281b6b03343fbe14dbe91cc6bd6101c532b38bdb08f5a
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, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38923ba758---46049194211.pdf In PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16082e99b288ef---kawalav.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/ruxutojalelenebimutagifij.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/kisukenov.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/gpmj4tvskg9aen8n85iuq9h6pf/dewojasaror.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/ade699f85b977fd21d3da7c0bb277949/bajefavilolaxikegis.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f23bd6deda---86297397966.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/35570682457.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/ba1a9b2d3086ffb0b07901cb0ebd0a90/gepemiligogokuvabijotuju.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/93252466413.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/bagiru.pdfIn PDF document text
    • http://modern-pro.ru/files/file/41902978722.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/dce5505a3eacfa214cf7846d8dacd271/denulobudolenozasosil.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74f5d21a01---33903303805.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/nokepudulirutokixuva.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/39ocls6nun42j46iu6ahbc4087/77248304691.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/894fb9d1fe2d7e930a2f1bbaf536e702/dadijepitun.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed3c2df3b0---84302834057.pdfIn PDF document text
    • http://keralajesuits.org/userfiles/file/88032155344.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/komuvalamu.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/nixezolukotoxebav.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/gafabumasakosef.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/jukutif.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/kolalimojewigiwuzedewot.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16076fef92792a---kimewurokibimejifewuz.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/8324391d949bdd6ed6fe7bfd190a6f4b/31353029355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=beginning+middle+and+end+story+mapPDF 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_off0000dc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC71 17128 bytes
SHA-256: 0071b64dee1bdd226652fffed3bd68da836eef8ed61b2042dcea48bf93b49f1a
font_01_sfnt_off00010892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10892 10900 bytes
SHA-256: 5cd2a709b54723934b6b990b3734e8a29c330663b3f03c4f27749751a54cedba
font_02_sfnt_off0001219b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1