Malicious PDF — malware analysis report

Static analysis result for SHA-256 8677de1c02da7693…

MALICIOUS

PDF

76.6 KB Created: 2021-09-08 03:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e76d028bcbfaac13acc92966cc172394 SHA-1: 16d70a7e92bde52fb14323643c98d28b840be002 SHA-256: 8677de1c02da76938fd02a5c660cd9cf9e4117bb7cdc4b29196fd7a144b0817c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/dd8352b480c15b335a31d40ba225da40/65055165004.pdf In PDF document text
    • http://daisytalavera.com/userfiles/files/28809868795.pdfIn PDF document text
    • http://raczcsalad.hu/files/92371442128.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccdcd96e2e---76691091409.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a919ca2397---12020964907.pdfIn PDF document text
    • http://hanleyresources.com/images/vugeger.pdfIn PDF document text
    • https://krusomying.com/data/file/72139352620.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161107f8e17bca---19195698559.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/bojupexepelajokelikamu.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/ddf224279f3e3b336fe50ef5b710b018/xarisa.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/skvejmntpp2gno52gf1h5ndqt2/kibawetefefovuri.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a832fb6a609---82498173771.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136f2f7e048a---menexuwenodifidazajeza.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/wisuvopi.pdfIn PDF document text
    • https://xigmatek.com/upload/files/4497395208.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/vikafejij.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d9923c35c5c---53070949511.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16113757d76667---60670022858.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/jepadukesefekofedevi.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/dokiluxurepokimuvogobofej.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/43576304220.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-4/20210704072732863075.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/gesexexapuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=elegy+written+in+a+country+churchyard+summary+pdf+downloadPDF 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_off0000c504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC504 11352 bytes
SHA-256: 6b542c321966e05f550d6f2c739d9c99c67b4b80e4d686151306ea2abe3fad74
font_01_sfnt_off0000df62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF62 17524 bytes
SHA-256: c3934be17e9c870059f0b6c42e85d6d7106bd7ae491dcaf2817f67b4c20faa23
font_02_sfnt_off00010c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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