Malicious PDF — malware analysis report

Static analysis result for SHA-256 30f25e9fefa28b32…

MALICIOUS

PDF

88.2 KB Created: 2021-09-15 11:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 770746922db34f875f62929cee839bbe SHA-1: 64e477beca278a02505f801e94f25eba67f18184 SHA-256: 30f25e9fefa28b3236325d6312cc297c736d7dfa72f23ccc92ff8feae3691f2b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting it functions as a link farm. The presence of 'utm_term' parameters in some URLs further supports a phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=oreo+tv+latest+version+apk PDF link annotation
    • https://rrr71.ru/upload_picture/ditolariw.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/75232914311.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136c370c03e2---85803287689.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/bibikumenilukudinatekafub.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/55e9e5fcb26ed1b6786cd83249a6d4ad/vogedugunatodenajukexon.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/3peav5p6bicu5m3l39jmm5ript/pumoj.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d57c67e140---bowosokojebip.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305350464d6---bibizire.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366b63c65c8---mewatefotatufanubuwasad.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/pofod.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/39285202404.pdfIn PDF document text
    • https://rintrans.com/files/pigitewowuk.pdfIn PDF document text
    • http://trevorhannant.com/sogipowimeposozadu.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/rubotiwuguzumi.pdfIn PDF document text
    • https://anup.bo/images/files/48167168499.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/jiruf.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/penonazatub.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614138a333ccb---givagafuzadejip.pdfIn PDF document text
    • https://electroagro.es/pub/files/mijejemikasemeb.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/pemutiwonopefudadolixabex.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210911205404.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/remunelujovibafulid.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/67943056463.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/mosizenezupoligamekino.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_off0000f4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D00 10428 bytes
SHA-256: 197482ca266c6b88c0c3c8906c0282b5997fb3d757a26a325d77ab3f095ce188
font_02_sfnt_off000124c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C6 18036 bytes
SHA-256: be7857568fa58f35f319a1d7e15d5730f90076d56883b9996e41fa5d996fd22f

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