Malicious PDF — malware analysis report

Static analysis result for SHA-256 b501801acb7ee6d4…

MALICIOUS

PDF

92.1 KB Created: 2021-06-28 01:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 707e58b93c54d58bc7f7a67eba677ae3 SHA-1: 9dd74302f74d11b161d03968e580934521246bce SHA-256: b501801acb7ee6d48f70be66caa07e015297171e685ee6edac180af310d18eeb
156 Risk Score

Malware Insights

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

The PDF file contains a link farm that redirects to other PDF files hosted on compromised websites. This pattern is commonly used to obscure the ultimate destination of malicious content, often leading to phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607736b7dc577---viwinoxerifiz.pdf In PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f42b0973fa639e3f95401e778465a78b/5558293851.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/muxitovobakigewowuxosi.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/feladogumezupe.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/7efed86fd92715571a0cd8d8d57071e8/8924073133.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa2e81dc24---gejipugagodajakigedibita.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/8082668688.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9274cf2edc---jejuguxidelal.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb91211b270---nibamenepapew.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ef9164fd5---63085761981.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/o6e91baso1q1ks7kmuntdljn46/90530879159.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/20618018933.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081d05e7291b---zosavuwedonuwiropusotu.pdfIn PDF document text
    • https://irrisyst.eu/files/file/29193070553.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/7nfsiohi9eddgl502umf9ftmi1/40230710807.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/32374314740.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/danawezimulorufi.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/21795175342.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160834158c49ff---bozetego.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072ea2f3f606---33076177649.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/09u66d9bl7dm6n51oi8okho28t/41349775684.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843a705c771---4676810051.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16078f0a6a04be---nafutatepawal.pdfIn PDF document text
    • http://brlairport.com/images/file/gefanewododatelad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=straw+hat+pirates+all+crew+membersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF991 17704 bytes
SHA-256: d9cc3bcf5c11254703711b2578568c2c491f3f5f3805f83c88744dfbdc98b019
font_01_sfnt_off000127a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A8 10716 bytes
SHA-256: f62c30214ed4380e07323a1c8d160ec8a6d5ac58c108356923e34df308485977
font_02_sfnt_off00014015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14015 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15822 2412 bytes
SHA-256: db45d567664de61bafc935320d7d69fe408246c7b998dedc6585bdf3990dcca6