Malicious PDF — malware analysis report

Static analysis result for SHA-256 b588e4dec14ea2a6…

MALICIOUS

PDF

79.5 KB Created: 2021-09-19 17:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2bf98d920d9069a3cd9ec604fb4aa963 SHA-1: 79dfd927cd5e9c5249b0153939c963f264fac494 SHA-256: b588e4dec14ea2a63032bf3ef7014644a2bad143db2169b52aaa1080b1d7e4b4
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various websites, many of which appear to be compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the document's purpose is to redirect users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://3bbb.fr/ckeditor/upload/files/wisasisevonotafowokadi.pdf In PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ale29iifh52da471mei1ja5234/pitidurinobeje.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///pulitavaroxuna.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/napofazoneregelunuju.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/kosapawuwegerofofizip.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/9b617c679cf99fef0dad6e4724d9603b/62692907940.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/dolidukumubukisuxovap.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/wavinogego.pdfIn PDF document text
    • http://fitviewer.de/files/file/94956910057.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f950b2c77b---fanubitinuwamomulu.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408c991ebc0---72589408803.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/c110dc1afc5ed28d705eeb9adf747fea/kevesiwejed.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/52418584043.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/69502885496.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/40188013745.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/8b192b0cefbf0f57294db27bbaf08927/56598080331.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/romokizaxavoxofabif.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/demurigojigo.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/44257816006.pdfIn PDF document text
    • https://alohasafaris.com/files/kebazevadewujozos.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/76486957156.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/wisosofimokujutamesikan.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/dopuraxisarifaweligosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=kar+game+apkPDF 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_off0000d6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C2 16940 bytes
SHA-256: 41c480946bcb92f17c396129679a46ebc0c73acec23083745c2fc180882c632c
font_01_sfnt_off000102b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD0 10052 bytes
SHA-256: d1a229fb13f4809a7bfda9fbe724af3bc5f1acdad64755a60950c98c6b02bea0

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