Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc15d5ac6c1b06d…

MALICIOUS

PDF

87.8 KB Created: 2021-07-18 13:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 09cf8b4e587890be4447f7778dc39822 SHA-1: bbde1a0e52cac7086c7cffd24c77e475c1d64e6a SHA-256: cfc15d5ac6c1b06de246deaaa37eeef0e54883da37f572148a215230383a04b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV. It contains a link farm with numerous URLs, many of which point to compromised WordPress sites. These links are likely intended to lure users to malicious content or phishing pages, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb4707e83a---xesezetutunozufeferig.pdf In PDF document text
    • http://imbirimbir.ru/files/mefumuvimaguki.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/tf1noe853l3qi3t0v3kf2duhgh/20904845276.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/95801731885.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/49ba7b963953e1aa05f55f4e013536bd/nebidunev.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b24f1456efb---39656461865.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/ef4d4e5e3addc6207e77249ba46c24eb/baninuxaxura.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/96863424755.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608df46e90d63---dujikop.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/pegonagiriruvakusodavu.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/pinurupaguwiravuku.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/1869423076.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076961a491dd---kigoximawa.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/4ac8nv2k3vsvuu49hgksqjr367/74590249419.pdfIn PDF document text
    • https://asiabiru.com/contents//files/1610477397.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/9vfmvps2frd05gu0loi1v4tihr/dexajunenuvuxurafa.pdfIn PDF document text
    • https://actorconseil.com/files/file/19513156904.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/ttv589jgvto0begqva0e61aa69/97915901595.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/48319720337.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/8f8264590acd35514ab5dcb030dd02ac/49624267653.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0f0d71c65adf2fdb14404f34636874ef/17130962108.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82da5a07c---73767485765.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d469d3debe5---wonijabimabeka.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/e5l3o3fj2k4kkodgia8orft2ip/47623845878.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/275v64svjnpf2u6oq7n7utnjr1/sokupudezazife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+brer+rabbit+stories+of+slave+folklorePDF 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_off0000f40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40C 10468 bytes
SHA-256: a5ef6a661a46dc9984cfe262b4fbfacdab0ff79ce7e6040f4b6ff633b7a6811a
font_01_sfnt_off00010c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12419 17656 bytes
SHA-256: 77666f524c47d9c7268fe83e19e4b644c43d1a8a39af1b78a7ac72daaa6303a5