Malicious PDF — malware analysis report

Static analysis result for SHA-256 805044ff940f280c…

MALICIOUS

PDF

85.3 KB Created: 2021-07-15 23:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ef413272a3f4a74721bb9244d075732 SHA-1: 9a84d0165b45ce95c7c22e2e6a6d89ab425d6511 SHA-256: 805044ff940f280c5e8cd70ff2a172ad992ba21a3c8569fc4a68d35e56b83160
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious File

The PDF document contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to obscure the final destination. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of these link farms suggests an attempt to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7129

Heuristics 5

  • 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
  • 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://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fad9474c48---70880987585.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/833879cbba32d7b0fe43e7a575dcfd7b/43097256809.pdf
    • https://menu2uplus.com/images/file/najikikub.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d59b988aeac---bademepugan.pdf
    • http://nowyhotelik.pl/userfiles/file/91582376239.pdf
    • http://oasis-inwaste.asia/files/file/14457524331.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbb3e8ea50---risefodejizali.pdf
    • http://cosmickino.ru/sadm_files/pigapurufom.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087b9faaf9a5---tuxolojegorenepuxon.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a0be1a9d2---diputokig.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608099fd44c8a---makiroxamatanapowurunari.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/7c2d1564d2ae0013bbbd382ae784b327/573351624.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/85c87d6cc5627205cfba2057f82d0cd4/5449016112.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16081a81173d01---95513986754.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/494c463d9b369278da30f78f2486011a/pedumaxotekadageral.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/eacc52d55c86155b9a3bf6bdf40b2edf/13616985795.pdf
    • http://hoggard1975.com/clients/a/a4/a43fc1111b7ad4318f8b553feb79a890/File/dixakogalijaz.pdf
    • https://ifbscalidad.eus/files/galeria/files/32095026.pdf
    • http://tortsurprise.ru/upload/redactor/files/dosebokukibopora.pdf
    • https://baoholaodong24.com/userfiles/file/52414520538.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1cd21c129558065061048308f7f1651/misatepogamanawusuxexixe.pdf
    • http://wsp.pl/userfiles/file/69670190767.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/sppv1qjs0c91bi5b897vf3bslf/48413583108.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969754304b1---retotozamevanamunugerep.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=is+2+perfect+square
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c37.bin
f6c4277a78ddd7fc84c1dbc6f94cac0ec9caffae4bcf2c6ac79e521ca13e8f8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C37 18256 bytes

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