Malicious PDF — malware analysis report

Static analysis result for SHA-256 816d036a1bc05389…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 03:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9306001a7e1a655974b9f9c7f1540fb0 SHA-1: c55c4532305a802394edd0b7bfbdff273c860640 SHA-256: 816d036a1bc05389ad05ccdc8819417aa8ba0fc1e3d42c4faba53b9dbf5cde45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which point to compromised or disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, but the structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://indianspringhomes.net/userfiles/files/biwifojumexijajorofab.pdf In PDF document text
    • https://ancoraeducacion.com/images/3007828073.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/jumap.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/52040156269.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854a40e547e---ponisaposubugasek.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/71523406954.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/32555414807.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/dojuvenejur.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/lujumafedikorinira.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/57565828143.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/zewitukosugux.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160924f2ba71be---polasaje.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/a8f0749cf76299e81677e844589d880a/22629142821.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/8qh87f90hknlsug8u5rikrubk7/74030527866.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/julodotuwuledavazil.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/fe68ac65bb3ba6947c497b6edd3f6114/vijawoze.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d96a139f9---ganurogogilubuk.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/84596788793.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610d80cc399f5---66250844557.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/58586744910.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/a81fb7783d08aeb43025441507cb6cfc/kavowarefezazikuxowa.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/xarevijevaserijijeba.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16121184186aca---49918961557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=altered+chords+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB7 10340 bytes
SHA-256: d7b6d7987da7cb9ba05d5f60fe108d15a3c98b6d6b4264e6a555035ba7c4838f
font_01_sfnt_off0000f733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF733 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F45 18508 bytes
SHA-256: 3dfccb15c8497fe86c4700682430230731341a8689b5d9d235b9164c1c89a880

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