Malicious PDF — malware analysis report

Static analysis result for SHA-256 833cafb4b0fd4f9f…

MALICIOUS

PDF

98.4 KB Created: 2021-08-16 15:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8e4c7034f62d28159dd7ff2a3aa4a298 SHA-1: 3658ac3cdf146657ee573a0bc5d3f6cdfa2e10c5 SHA-256: 833cafb4b0fd4f9f870f4a72799421fcea906069c55eb88138a1398797a4dba4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates an attempt to leverage these sites for distributing or hosting malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://philabc.ru/uplcv?utm_term=que+es+la+variacion+proporcional+directa PDF link annotation
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f19f30f77---mimisanuzavesepumu.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/c78f4184b87e186a251741369db1d5d3/35436280498.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/luxirejiforopisibev.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/kodidumonetaxojazowadebe.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/f7720f544f0da2ad711abe8d4ac02a4c/96752577816.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3c2540a91---96859101138.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3386371ecf---lexijokokejinajizagaj.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc88290daa3---16932879720.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/54326239173.pdfIn PDF document text
    • http://ecole.ru/text/images/file/75878054905.pdfIn PDF document text
    • http://simonide.org/userfiles/file/goguwejak.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/86629634247.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/445c694e5fb36092463e9f0fa4aa26dd/bumejejopejuxetotegusiso.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/12694131827.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/5t76apm8k871mq5eg3snj3juna/49451643654.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607360d939a75---viwuvi.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/tafobuviwuvuju.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f7e43c3c245---68637709181.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/winejewagumopedofitej.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607262bfbe833---wujezafabamos.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/12787626228.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d29bbd56e---soxurolaxopoguwirorosezex.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/vofopadake.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118ED 10732 bytes
SHA-256: 3c2de4100aaa7e2df229bb2a7768389a0a5544df61a0baae3a12e2707f70ae99
font_02_sfnt_off000131d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D2 19216 bytes
SHA-256: 39ccbc331f2a23dcbf36454984405ad5a1a80f026bab4565664058fc37dcb858
font_03_sfnt_off00016360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16360 16068 bytes
SHA-256: 50fbe1f2c03abd742d8055d3199ecacdf9af2c96637a5da7eb187f4952616080

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