Malicious PDF — malware analysis report

Static analysis result for SHA-256 c224a9399fbf35ae…

MALICIOUS

PDF

83.7 KB Created: 2021-07-17 18:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c144f22fd7e5424884120bb7d5760a53 SHA-1: a88b691dd92ae2e3779087db02bef4e2e9c6c1e1 SHA-256: c224a9399fbf35aec25151d337a7ff4c1dc12044c3b051aa4332e8baadceaeb8
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress sites, each hosting another PDF. This pattern suggests the initial PDF is a lure to redirect users to further malicious content, likely for phishing or malware delivery. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607700792d5c3---81572256001.pdf In PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160d035c606094---kozenazojapa.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/09d52307ea6e15802628c59b7c01771f/42374346919.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/b904d14813ebf3cc8c677bf5514aae1b/fovexonepabilovakakoku.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/nipixi.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/487abed82bca37904ebedcdad5645137/2264044579.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/pasefelofinakigibelafevep.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/351ccacc07a188895fd532f260f3ad43/tubemujemo.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/28253578807.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/tejanupizabumuxodeg.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/veripewibidatezewali.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adab4744dd8---fupulejisumizapopudowigup.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b4df5110f0769ac31024a055a1bb579a/26185663502.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/9bl8mvsgt88makpsoqv0lcte9u/37429568920.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7bf2e9bf1---zubexap.pdfIn PDF document text
    • http://northcity.rs/slike/files/35378222888.pdfIn PDF document text
    • https://spark-care.com/userfiles/file/finimasep.pdfIn PDF document text
    • http://standdominica.org/files/files/30389099095.pdfIn PDF document text
    • https://digireg.es/upload/tavolunesuxogipina.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/62444859293.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d0b1e298d---zitavipoxojiwega.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/394554d099c8623f2c6aad10325ea876/69341080769.pdfIn PDF document text
    • http://com123.vn/uploads/file/86281020748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+colour+clay+in+minecraftPDF 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_off0000e4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E3 10620 bytes
SHA-256: 38b8d09e8c57cace6b3ae40a28fce4e72209557b7fae093208915a3346b7ea34
font_01_sfnt_off0000fd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2A 17020 bytes
SHA-256: 33624a37dc3d1fd44c51eedae2616f565251d2de0b489c6a329f10760e64960d
font_02_sfnt_off000129b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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