Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6737390b8b9faa…

MALICIOUS

PDF

86.0 KB Created: 2021-08-26 14:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b79fa8bf8028974fcec41ecbbd2bdd8 SHA-1: 7d0ba1c4d512ddd0f4d756e722cc738855123f59 SHA-256: 5b6737390b8b9faa8175b1d1143fc561c620378a2332394fc1a6bc89563b980b
256 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting it's part of a phishing or scam campaign. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary goal is to trick users into revealing sensitive recovery secrets or private keys.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/vatipumuvibinusujojud.pdf In PDF document text
    • https://delcinfo.ru/img/files/files/fesutikarigowejopot.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/95141264720.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/78821265946.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160fbcaa6f30f9---kanijiw.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1627773172_2655c6974a.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/15473564043.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108a1d28b9ae---62264427873.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/6605e8c4116351d71971585f3df470b9/74187193450.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/f803479227cf6e9a093d683599a95f9e/tenositagema.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/78b4b59fe86c895d20ac11bcc8f8fb9e/votenepologoz.pdfIn PDF document text
    • http://rld-carbon.ru/file/bifedewesil.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c8d274051---mewaganazajedomazug.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021060706294238.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/uvhq7p2vr0c33o3av5m3utat05/numikoz.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a57033af695---29441011213.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/gifivobenufosidazuzi.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/4ba177306132dde6efcd90159f4f2e11/37722363001.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d08c2808a03---gagudakisatupajumepinero.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210523010548.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcae275c3b1---73216633053.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/savipifujezaxajatepul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=fonepaw+android+data+recovery+registration+code+and+email+id+freePDF 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_off0000ea41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA41 17312 bytes
SHA-256: 3e105b451fe9b9d1dfb76d950b179a3828956b9df9ef05ab01e4d7bc1896384c
font_01_sfnt_off00011721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11721 11204 bytes
SHA-256: d2e7509a387f17b50cbc0bae470d75eb9b05643fa6110f6960cf1881de0b76ed
font_02_sfnt_off0001312d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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