Malicious PDF — malware analysis report

Static analysis result for SHA-256 8307bfed923dbd10…

MALICIOUS

PDF

128.0 KB Created: 2021-08-09 15:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 207defdfc2540c4090ce3ddb3b59d129 SHA-1: b8a44f39855a583d75ccd94f2a1954a82e52a777 SHA-256: 8307bfed923dbd101883503e88124513b749a3223a3535530d6945b905fa5381
196 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'Password-protected archive handoff' heuristic indicates a common tactic to bypass security gateways by encrypting the actual payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://medvor.ru/uplcv?utm_term=manual+tp+link+tl+wa901nd+espa%C3%B1ol PDF link annotation
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/24091575473.pdfIn PDF document text
    • http://blackwingsexpress.com/upload/userfiles/files/86046575331.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/18191927953.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/93ce296a70b8467df3ad68510f55b1e2/tovebavevegejizanodimel.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/nivugirinomodevix.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/54901319061.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/27439052945.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/22693926405.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/92617742587.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09091368f7---bidilopubefipulobuwo.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/rudotidodurifo.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16075afe593346---nuxalusorexotedakivaw.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096823a8092e---34311967703.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/9b178dfe50c87096cf822ad889e5b4aa/vosawuvo.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/s5lov3cm38l7o0dmslfcm55ro7/gawowamumisabujedu.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/pebelariru.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/6f953c7ca520e5626adcd4024a514672/loravewafafapid.pdfIn PDF document text
    • http://apcmagon.com/userfiles/luxomogebigi.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/ea31887cb6198f6b9c1b067d85ccbbb1/jifufisoluwesiw.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607efb0ec7e97---92070375251.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfce253755---3397913904.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D6A 18452 bytes
SHA-256: c1d015bbef9d958fdd1494cf9470068c2f60711dc24de225232408fbe7508df5
font_01_sfnt_off0001be52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE52 11104 bytes
SHA-256: 61012d1e29dbbc3a07ad2c571447add7b5dfb2246b89dd75dea2f39fdf60b536
font_02_sfnt_off0001d827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D827 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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