Malicious PDF — malware analysis report

Static analysis result for SHA-256 34955b1a330c33f0…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 19:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0df1184d6e7122ae1d726e05ef61bd65 SHA-1: 326f79a1b8b016e01a97e71ecb26ea2b6e367a66 SHA-256: 34955b1a330c33f019237087eeeeec6ed474871be057fd6476483c0ccfc2d2cb
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to various compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs indicates a broad distribution effort, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nsdadventist.org/FCKData/file/64274986167.pdf In PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161219500d026d---43697720428.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/0vv3ttdd8bt1vq8v16pb9hj4j2/62154153085.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/fc1f0104ee1f01f8d1d46cb0cbb53cbf/67721340602.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/38475496477.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/39b43aff7b4fe7ea39d1622d1f25e833/vuxogamiwiwotinilolifunip.pdfIn PDF document text
    • http://hangquangauto.com/files/8201375361.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/pufipogofuzafojowijusazun.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/98084716361.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/losenoromarebarokokodorij.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k6mqdggupckd41t1f7vhbe7r54/17177144747.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132f560c1401---81840511244.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/47177637280.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/gepote.pdfIn PDF document text
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/kevoviruviwodujabowas.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/59543560114.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/mexakulawamasezud.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/5f0a4dc945d489b548fc74d65bec8298/fevetoxoteziw.pdfIn PDF document text
    • http://esipro.be/userfiles/file/pirejofeveresudur.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160739e66d75aa---16857958690.pdfIn PDF document text
    • http://myqself.com/upload/files/68936308948.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/18048822134.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab19807297b---kosowefo.pdfIn PDF document text
    • https://congchungnguyenlieu.com/uploads/files/12803309160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=downloading+kindle+books+to+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_off0000da40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA40 10892 bytes
SHA-256: 21616788b6dd1972878fc3b9cdb3c84ddd7002628b629e5180d6f57db767bfbd
font_01_sfnt_off0000f335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B47 19088 bytes
SHA-256: ca8df35a1b36cb0b10cae27d5ce0046b5c2a47d0d49e28a8785cefe95346990c

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