Malicious PDF — malware analysis report

Static analysis result for SHA-256 239872addf8cd1e2…

MALICIOUS

PDF

72.8 KB Created: 2021-09-04 13:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c5494360b9a71bf4ae08bc3cac0c5de1 SHA-1: 46e6af403d598fe489114036d0ad4b25e80cdc46 SHA-256: 239872addf8cd1e289d6cf13073e2a06c5b323d9a6bfd207b03144b7a475930c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, and one specific URL `https://coretry.ru/uplcv?utm_term=silk+road+a+new+history+of+the+world+pdf` which appears to be a lure for malicious content. The document body is heavily obfuscated, but the presence of these links strongly suggests an intent to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://coretry.ru/uplcv?utm_term=silk+road+a+new+history+of+the+world+pdf PDF link annotation
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/26470b711367d0b54d70b6381bed3ed8/74966316035.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e16aa5b4b---taxowiwagunojinagivo.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vetiwotesuxura.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/21147605076.pdfIn PDF document text
    • https://ludbaegitim.com/calisma2/files/uploads/ragizagi.pdfIn PDF document text
    • http://rltclassof1970.com/clients/8/8f/8ff9f19c840b982a6efda18ba8bb483c/File/mebumakatedo.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/966eef8dbe5df1f7f4689e86ca01aa2a/juralivozakafulo.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/hu1r504poe0fui0di9kjpke8jh/bomizupabug.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/31410354823.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c56647f2dd---kasegod.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f46a05a845---gifej.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/lewosifopaduwadekon.pdfIn PDF document text
    • http://cpils.com/userfiles/file/vewaxebo.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/dalasepirabuditane.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/87167449386.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608666dad2f8a---zilodogarerudapugixa.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/pujikabeforin.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/vufowuganelebubafuzedolev.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd51b411af---69924459893.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/rurumupiwu.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/rikalufovobegejigowiwafib.pdfIn PDF document text
    • http://bjjiffy.com/upload/jedolixefofo.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/dedaxaja.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/japijijazit.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_off0000bacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACB 10960 bytes
SHA-256: 50cb838da7ce5241187c25b1923d4d378e5f1ade00d4d8700a060ad82928e2d8
font_01_sfnt_off0000d427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD427 15988 bytes
SHA-256: 6edc8c770140fb012cb7939a1af54d0478e75e48ee991c1aeb183a5f7ede35f9
font_02_sfnt_off0000fd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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