Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f964a3d32ae9d3c…

MALICIOUS

PDF

81.4 KB Created: 2021-09-14 11:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bdcddaaf107696df9a0ce0a5f400cba6 SHA-1: b8a307c7896ea3c862fffc62cbe2108f99d19ca7 SHA-256: 2f964a3d32ae9d3cef03b71b81fa21a7fe831bfaaa5ce36bdbf0fe028988cf2c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised CMS uploads and disposable hosting. The embedded URLs and link farm structure suggest an attempt to direct users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/93a055a2bed8a20e9f88a67399101ae3/nezorerimujudato.pdf In PDF document text
    • http://fiumaradelsossio.it/userfiles/files/61880679017.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/36033642433.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/23942295553.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/83752189303.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/18092800278.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/babesebidozenowi.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109090534225062.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/98092677183.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132788e8b4c1---zunodosexetixawebogon.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/69885172340.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/pududowavizijow.pdfIn PDF document text
    • http://holzbau-napetschnig.at/berirabifiji.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/rukanemo.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/pebozoma.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/87474064323.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/69904264282.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/wemalarakomozusilanes.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fb3fcc4d7---7257180405.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-11/20210911082355622742.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/c2djt42f45cn0uh5066g795q44/milazuvav.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/penedaribubavedefed.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/zatinijobizo.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/pisagiwujopimajifoboruja.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/14f10e365d8a9407d143436f33361662/36775331510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=slaying+dragons+daniel+kolenda+pdfPDF 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_off0000d96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96C 17520 bytes
SHA-256: a3757efa817d4a668019a18667b7430ac618fe3c0339fd9f2e2e4cf9170b6606
font_01_sfnt_off000106d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D6 10856 bytes
SHA-256: 4c14d753b1b8b4f0a18b1cb1bada51a7f789e8276bf452be3e8d044c98913ef8
font_02_sfnt_off00011fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1