Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4ad47c8227552b…

MALICIOUS

PDF

73.0 KB Created: 2021-07-09 15:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6406bd19c068fdc49fe0f41cfe026071 SHA-1: d9ef59b5b8e639dc4e7c2b70f26a31e0ee25cd5c SHA-256: 5d4ad47c8227552b2bf973d7ad6ee1e631c740adc4f35d584d5a2f36088bdf86
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristics suggest the document's purpose is to redirect users through these links. No scripts were extracted, but the structure and URL patterns are indicative of SEO spam or a redirection chain to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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://macap.nl/app/webroot/files/userfiles/files/xefoledepif.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160863c3ceaeb9---vagigi.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/e7pgd2912g2siqonf49c1vbqt7/4337434567.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc46959a5b---jiwojevezowakudizusu.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/4qeu5g1qohf9dncd83uk703jq1/43632120420.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e38e4d95a62---zikemute.pdf
    • http://aquatrustfina.com/userfiles/file/gokofunora.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ed751b062---fusuwowupewevemibaxij.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/8f21bc0ea70650e682e8c47c8bedc574/lafigirivifosidisasoruk.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c5211ab8c---xexerogigujodevunok.pdf
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/94395181946.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609af760d9ab6---9513467736.pdf
    • http://daoltrading.com/userData/board/file/jovodufeguzelirene.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc3e13c2d7---bavom.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/494cac7f8ed1b1a3cc19d2fa16182a56/29586387121.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf0ebd847a---bimalotolumixegow.pdf
    • https://wegofa.com/userfiles/file/midowajapaxigiwiwojosowam.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077cd1fe8b6e---69992557467.pdf
    • https://childprotectionindia.com/lexcyberia/userfiles/files/lelimij.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/ldc7sktth41naukotdihb3bd97/lofiv.pdf
    • https://mattress-leader.com/media/28430423985.pdf
    • http://driscollandgibson.com/images/edit_images/file/vivugikagebuvojezuf.pdf
    • http://driver-jazda.pl/upload/file/tizazam.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=integrated+circuits+by+kr+botkar+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baf7.bin
e53b89ce0e4c57786d216298e47fb0512e7f26fc500e70a505fc7d6a52fb5b19
pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF7 16192 bytes
font_01_sfnt_off0000e4ea.bin
b068990fa884f9110c450fb36f4cac8f8b7bc92f50d36d49edbeb1d446f76263
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EA 11148 bytes
font_02_sfnt_off0000feb4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB4 16792 bytes