Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66035aa81253a92…

MALICIOUS

PDF

75.0 KB Created: 2021-09-26 12:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3190795720169612824276ea5b165bcc SHA-1: ec0a2eb6ade0dc0c4f8a8da352d01cf121abfd14 SHA-256: a66035aa81253a922b17c03711d2ff19e2fedc3480b51cc39a3bb7a52d60b3ae
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=chemistry+class+12+name+reactions PDF link annotation
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f691dac056---90916977839.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/c337e881eec22e7a742a341834510d8d/xetufonal.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c80b86ec55---bibunagu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/s75a0u5bpjeekva2o6b2o39qei/79911136566.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/fobokepapebixaliwavo.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/fajefomamilebu.pdfIn PDF document text
    • http://canoeing.by/pics/files/tifot.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/31601906092.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/gorarokoxononexitew.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/mosokesuzevenunar.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/95819283148.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/43405126614.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/c8rvb2m0pklj8ckli8i8e123vs/68847872711.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614430c38bcae---9423804734.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/nivavudexenisogifumeve.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/59374885568.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/59204125031.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/99566974996.pdfIn PDF document text
    • https://combrooncom.com/contents/files/fofokefopegi.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16146eda40fa3b---43288819779.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/medufuguwuzepagozolunido.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/05/58458501732.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/buriboxowufo.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_off0000bc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC38 19080 bytes
SHA-256: 4f87df006f0cf17d2f99f1c86e48ae04bbd6145dbf5989fc7554caab2d752411
font_01_sfnt_off0000ed80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED80 10812 bytes
SHA-256: c1644e1c35878848c2ec5562eb9219340aaf2370528d5607687e3e40ab56214b
font_02_sfnt_off00010668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.