Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b0ac161aec6c937…

MALICIOUS

PDF

84.1 KB Created: 2021-09-02 04:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7dcc621d4195c64da78c8ff9bead6c43 SHA-1: a37b68247b4f7522ae7fd28a45a0388fd3d63d00 SHA-256: 9b0ac161aec6c93724cec86f85566508eba32ec90e80b53259c38c9e5b02c3d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many of which point to websites that appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farm heuristics and compromised CMS upload links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://chcial.ru/uplcv?utm_term=north+branch+potomac+fishing+report PDF link annotation
    • http://kompletucetnictvi.cz/files/file/duzavimutovimafow.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/dujusevegosem.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/30653282289.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609a6aebefb93---26194152341.pdfIn PDF document text
    • http://lactopad.com/uploads/files/96496384923.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2858fbe388---dukugamabobuduvemeba.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608b32fd098e7---buzupofoloneke.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/2071371977.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/lapupogomavaguxikaxaru.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/e424afcab2e764b626817145bd4cdd10/bezokejuvakedazukemulizo.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/15062f5fa569f5f9792815bee82bd076/vixevufebagiwezo.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/toniriposur.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/21728954159.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/nimaradidapemi.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/a8082a6e73e8a7b850a11ccf513dae16/66692298244.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/jofifofobanawuku.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/fugazamiparuvu.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a72c4854ae4---nobolifejerujiwimujezid.pdfIn PDF document text
    • http://portableandcool.com/files/files/11960052695.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/nivujapusokurewu.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16099c59a88b97---dozaludafapiwugupi.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/belelafa.pdfIn PDF document text
    • 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_off0000e289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE289 11000 bytes
SHA-256: b8d23a529ddf3bbf787852977b85815f50a7953123e71b1015af1ce201612160
font_01_sfnt_off0000fbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB6 18204 bytes
SHA-256: 5aab41840c9a2e6a96259705f6d6aaeec7376b38fcfc64a96da8167f5d3c0fcb
font_02_sfnt_off00012ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1