Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ca34e03c259d2e…

MALICIOUS

PDF

127.4 KB Created: 2021-08-25 16:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ebf9581b45b70dcde8d193eca99f86c8 SHA-1: 85e854ca8fbd89780ed202065ba68c3b5ae92e40 SHA-256: 27ca34e03c259d2e872272518056e7fc1222688b4cce0eb3ed2b2c2b83e18763
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to compromised WordPress upload directories and disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted from this sample, but the structure suggests it is designed to redirect users to malicious content hosted on compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/62308fb41a6b8bbc3a4fd0abe0ec4f6f/24268046654.pdf In PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccf411df34---poxutakomewuzizobu.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e02575aee---roxadejaravonefizo.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/wixafebolesewalobenag.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af98860efd2---34639068853.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/biweluvudatul.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/3565506253.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0ebf98dc9f94b560c77d6f5d76f24194/66866730628.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab5910a678---fonobizetubituruva.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/ca86bed97452d6d1e9fbf8bedc94f3de/pumipegif.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1dd836ef0---11026809937.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/niwevowuleziz.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c59a8584c7a---58808118723.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/gdur6fj6kl1qbhrfej6muuss1u/50732830559.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/upe6v55u41ii3piq819bhkejuc/tusosukikaxawujudapu.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/kulewuvagirexokas.pdfIn PDF document text
    • https://kermanrooz.com/img/files/11421982903.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/femexafenuwigenarep.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210726142724020.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/ferusekiwanitiped.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/35034022278.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b46563c45e2---25665002352.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/1iuikm071nr1dcmbvkgiieu162/wizefagopamotike.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/d82ba3aaa3730adab2d88add3096fce1/46687202335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+author+of+the+book+republicPDF 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_off0001944b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1944B 16528 bytes
SHA-256: 04893aa82a70b51811f7fc98994c3cb80b6630a1cba7b1627a01d469a93f25f6
font_01_sfnt_off0001befc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEFC 10600 bytes
SHA-256: 10815abc0f0d683c0441373843b921fd0594472a7684b06c4c5e127338e36dba
font_02_sfnt_off0001d716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D716 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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