Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c090ef5ab2f224…

MALICIOUS

PDF

87.8 KB Created: 2021-07-25 19:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cc8719dcc4e3ec472d6ef18202edc66a SHA-1: e8fd2e1224d206997200ffd078e76056414b1402 SHA-256: 88c090ef5ab2f224268db723366fe59b36c0be6588ee7fa35fa2198b2b18b92b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The embedded URLs are likely used to redirect users to phishing sites or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/5lm6n6fu03un2tlm6judcuiu36/14333461889.pdf In PDF document text
    • http://gocreate.termall.pl/upload/fck/file/fedemonijoma.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/35297461929.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/15651260687.pdfIn PDF document text
    • http://pvhs1980reunion.com/clients/e/e5/e5e9f74eb83211af097e98bf68d59c4c/File/bapun.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/52e5c5761aa5148667f285e5dd1afc46/82644123455.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ed92521c853---lewomopesixixafopewuxez.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092594fd3c02---guwoperagiwaxizomenaw.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/eh6fjtob479hogtkh9ls61puft/86388748548.pdfIn PDF document text
    • http://dgjst.com/upfile/file/96425981984.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/75174692338.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a161f222e8e---komuxamelokajutigonuwuzi.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/wologugokuwadimokolu.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd5e52360fd---roxupipe.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a599b555c---70766652348.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/buxomejafabek.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb97d36334---jimududixirenudewepizal.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a9be26f22---42814608850.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160845f76438e6---43689065375.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/vivat.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/hjnpgls4si5f3rgok0bgccrt66/zedejifumukedumij.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/lusezitazejurupekerozij.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-13/20210713031429567042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=south+african+history+book+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_off0000f309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF309 17380 bytes
SHA-256: ff33961a14fe41bc658bac1f35c2570afbdb54dcfb08e3f5eac6f779ca7cac24
font_01_sfnt_off00011fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13801 11060 bytes
SHA-256: 8c2c23d66b8a1aef3c9912b6f6ffe2529f572e9dac91633f4caa3d39ed9685dd

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