Malicious PDF — malware analysis report

Static analysis result for SHA-256 53efd896dfb2a587…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 13:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 67e20a2d7cc09c5a2e72fd802304ffd1 SHA-1: afae5ab3189b2e598b3dc829d59c50c360ea830c SHA-256: 53efd896dfb2a5879274e6ee9603d2bd0015fc5e48b0a4bdd05f75cf47f720e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oilmachineydy.com/d/files/pagupa.pdf In PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f8ed1241e8b---mofuxivotadamipasugowo.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823f3a15c93---dinelo.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b05d293d0---41660393588.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/d55a65b38167e67cbbe0049ae92a2bf1/fubigas.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/gifedavuzuxofunu.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/resojesosog.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6abe3a6141---wesomikiw.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff77cae9db---wavus.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1aedcc071---seroridalemur.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/tedut.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bc10adf45---pulamukowedebilib.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/92877400884.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/9c253a575045846a6dd8f4a89cc5e27c/bedawelogemusuxog.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/vuxadiz.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/lileloxerivodabojoruzulaz.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ce1a30bc4---71270016019.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f202f01d7---diwelipusivegida.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/4690089203.pdfIn PDF document text
    • http://shophouse.info/images/files/ziwulage.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe1d01b8908---telawifajixemefedosok.pdfIn PDF document text
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/pugugifurifokegumalana.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/lifomugeroxafamomotosamer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=advanced+statistics+for+data+science+pdfPDF 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_off0000dc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4B 17456 bytes
SHA-256: c6109ccfbd6710220ebecda8229ef063bec65966fba34ac6b028346be0e24b7e
font_01_sfnt_off00010955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10955 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001216c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216C 10616 bytes
SHA-256: f0789d0305645f222aca0b3116fa3b2266d059af0f8c77e50fda3de518e28d4f

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