Malicious PDF — malware analysis report

Static analysis result for SHA-256 249f395d4b2b1618…

MALICIOUS

PDF

126.1 KB Created: 2021-06-26 05:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7927595bdf638edd110762a20f86c549 SHA-1: f87a834c8b48372fd32993a688bc280447491726 SHA-256: 249f395d4b2b16184f99606383a8c8ce8b0861b99a3b9ef3a13e21a844a6764b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, with several URLs hosting other PDFs. The ML classifier and ClamAV heuristics strongly indicate malicious content, likely phishing or a trojan. The presence of multiple compromised CMS upload links suggests a tactic to distribute further malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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://dermatologie-chamonix.com/userfiles/file/34349288867.pdf In PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/toxune.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dddfe8953---nowefowuxamagepavexanerir.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c09eb3e8af---gijiwutikozubopugov.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608873be5b757---zozabuvosewoxu.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/nuluj.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/b5d681f6e121d2b80cd5a0e60f26fccf/baxinigosatezil.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607d30d770b12---vaxodokisanafafufoji.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/jakokegubowu.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/kigotibelewibutelabozum.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884d4ac7472---lelujadopiridujufuf.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f3c384a79---kesekitokujenebov.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/45746326278.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/99554084796.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/62052523488.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160867d10dc3e3---bumosifefa.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/98ac50f9de3762f677140d871c00d122/nenemidomejanedolomore.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210509183357595.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/0eoqmabpv2bcqsmltp70406kcl/72180643157.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6d6871ae6---renexutanuridibolip.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/podojononupunuvodusi.pdfIn PDF document text
    • http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/24305939226.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/benuw.pdfIn PDF document text
    • http://pmteventures.com/clients/5/57/576e8e71b788aac95a268099fab76a3d/File/kapubujuvoforudividija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=introduction+to+perturbation+theory+in+quantum+mechanicsPDF 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_off00016062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16062 16512 bytes
SHA-256: 13b2f4c110a2e7268b1d2a2ac57e28ed5c4765c87fee5be6bd6519c1bd83100e
font_01_sfnt_off00017766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17766 23736 bytes
SHA-256: 129b2b1193c6a5e7044e11d3e912606795d947ee152db1f1b7dbac8c932ed14b
font_02_sfnt_off0001b86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B86A 11184 bytes
SHA-256: b6891162892fe9106c9e880b7ec652ddad9cfc473b84e01b961adef0d464d4ba
font_03_sfnt_off0001d202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D202 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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