Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b07562a4045ca6d…

MALICIOUS

PDF

97.6 KB Created: 2021-06-28 08:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: befbd1af5916962de358cfbdf59ad7d1 SHA-1: 67eee50e0f2fce7418ee98b94066c767dc52e0be SHA-256: 6b07562a4045ca6dd670b02e149b452976472774ad3465991b838d917117b4cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites and disposable hosting, indicative of a link farm designed to lure users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern leveraging external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://smidgel.ru/uplcv?utm_term=how+do+you+make+slime+without+activator+or+glue
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/106ee8ff84286b3732c147cad5fcc8a9/37480758372.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ab9098222---jetonutuwatamivin.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608749247bd57---32626624559.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778ec924c97---sapadatulirorena.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2e86a84d9---bubupa.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/8517bb330710fcbf49159612e669874a/boraf.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c34f6db883f---jefulakuxotusudowakoruzow.pdf
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/fujil.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3dcee5633---palugowu.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608325360c6cc---zepokuwizolove.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c8729e26d---polegekazage.pdf
    • http://curry-box-deluxe.de/userfiles/file/72121066173.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/jsv3cjv1hfoa8j1dev2tn3u3c2/gipudojuvuge.pdf
    • http://mega.kz/media/upload/files/pojuvupanaretuso.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/0ec83cfb703ebce62794a50553a3db0f/98985762963.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a176196002c---80148626323.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/9b7fbb69a05339734ca22ad0fa4d5e51/46144798483.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0d7e39aed---puwuxon.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16074b6b39999a---runokazifet.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/54e86a03576900c7b6c92be0f2583561/63518325040.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/ocr55vc8vtkehepndjhmaur34o/lelapodirajububafoxarozo.pdf
    • http://laweasy.kr/userfiles/file/71434263399.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102e6.bin
cd4450bf782e84d65b68321fa696b41befc8fb89672bcd92c03f7d52589ba2a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102E6 17116 bytes
font_01_sfnt_off00012f03.bin
680e586a1ee573e661d30ea0f7a97a8805d5b79b2e3d5282e6cd27ea8e1e9edb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F03 16632 bytes
font_02_sfnt_off00014618.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14618 16792 bytes
font_03_sfnt_off00015e2f.bin
16b1f774cf6aadacaed6639c28297728e2ed46c3ab00cfb10bc8b14a35675aa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15E2F 11160 bytes

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