Malicious PDF — malware analysis report

Static analysis result for SHA-256 954771b2333d14b4…

MALICIOUS

PDF

100.5 KB Created: 2021-09-07 08:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6ef19a462aad58e725b1a4188ea73765 SHA-1: 6595efc791ac708259bfb16ad15141a1642936b4 SHA-256: 954771b2333d14b430c7785d52aa9988e687848bb1a67f5b96ef280efaf59761
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or scam campaign. The presence of a link farm on compromised CMS uploads indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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=speculative+bubbles+crashes+and+rational+expectations+pdf PDF link annotation
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/tavetidususovogiwo.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/bijuwewifatome.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210801_210010.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/timowepisivedetubil.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/xiladosa.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/jidiruzap.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/45702951666.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd7dbd1ae2---gawexuleredugozanolipu.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608656709da3e---84672383949.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/6a59c613dd5f4313a09dc89eb1f0c4bb/daxagijipurif.pdfIn PDF document text
    • https://artbynela.com/uploads/file/kilawodabanumoxetexape.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848c7b95a29---86428340210.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/nototobisegetimategubawef.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/mebesurin.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/libis.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/rijibosatijonakedefovul.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16097739ddad56---20099495242.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/nepomefikajulikusamo.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/c1d6ff22ecbeccca3919a4f9c295081a/raretido.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16098319c5199a---xufunozinefimozefupeniwo.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd98af63516---bapomeluw.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_off0001226a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226A 18640 bytes
SHA-256: 0de3e9767cdedbc300eb80a5e054a1acbdc7eb6bc757958cc8bcde8ab155510a
font_01_sfnt_off000152aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152AA 11200 bytes
SHA-256: 6f92da00e0b652afa3dc1631b95e6b50481e4669f287363f5a5cf0d52421b656
font_02_sfnt_off00016ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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