Malicious PDF — malware analysis report

Static analysis result for SHA-256 29097a93930a6b5d…

MALICIOUS

PDF

98.4 KB Created: 2021-09-19 12:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a64c79d0a704525ed78e6a478a4113d5 SHA-1: 843e8a8d168a339672ab1f1820e4f527b92f882d SHA-256: 29097a93930a6b5d11cb889af1372b0ecf91214855771617a3d94b4f88f93370
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. While no scripts were explicitly extracted, the nature of the links and the heuristic firings indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5048

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://rosebankprimary.co.za/inc/ckfinder/userfiles/files/xagurifunam.pdf In PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161304400d4854---85217546476.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/563065191.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c7d53dbcb---gajosijeburigagojebujux.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/9cacab4cc9a2cc345fd8243ba447208b/29242922816.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/nubumajadakiw.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462c88c5d5f---29896033926.pdfIn PDF document text
    • https://ms02bet.com/contents/files/12650344584.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/65648616988.pdfIn PDF document text
    • https://ptogel2.com/contents/files/9479769643.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/31345983009.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/xifefevatev.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/qcjdmbhjhfb4jvstdh9uto6oj6/56424577320.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/xesodevigema.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/48264910409.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0033037f7---52709903080.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/73040250957.pdfIn PDF document text
    • http://kmsenior.org/file/files/14391940592.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///vukowapusotimagugib.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/fedorizofukiparinenebafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pokemon+emerald+gengar+cheatPDF link annotation
    • 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_off0001274b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F62 10652 bytes
SHA-256: 1febc879c698a1855e03458fd58fbefd041717c6ee9dda702b10cd9c23082d7d
font_02_sfnt_off0001575b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1575B 17456 bytes
SHA-256: 69f7cbe520bfd4953dae8e0dd58d44646ed724a289e3a1741c0db43c575861ad

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