Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b00ebe6a61f99d…

MALICIOUS

PDF

80.6 KB Created: 2021-06-26 11:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 53a1121730af4c985627deccbbacacb5 SHA-1: 96021ff4aa83843a45a905d1303593878a41674c SHA-256: 59b00ebe6a61f99dadcc47c13e1eebcc6f3613809f252ec208787c47ff9f2387
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 pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest an attempt to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://chcial.ru/uplcv?utm_term=character+code+for+check+mark+in+excel PDF link annotation
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/b2a2c735a429b2c47416995d0d4afc64/pugojawenux.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/54016584238.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/zaruloxivepanoritosiwe.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/22873916416.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/zudon.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97401f0a6---kabigore.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///80798035462.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a02b8e2299---6398645053.pdfIn PDF document text
    • http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/69172370006.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/64bbac4573ddf2e5c32f3f6d617b3133/filabola.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dbfbc6b9e---mijezelagogajafol.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/7f3966a981d0093cf995e8fd971fb450/wakejekefepowi.pdfIn PDF document text
    • http://coumert.com/images/file/rudavifabirisowobiwu.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/84855335485.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072ed3c65dd2---femamumixeniz.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f25f8b2c03---xexatetisigesuzuzenu.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160850cec878b0---80874017195.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/144nl8f2u9o56j1m7aghq17h3n/53896653058.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b47197a681---xalebulatisag.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16090874a99687---fepuvetuxofitub.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/roxalewopifuzofu.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_off0000d8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF102 10800 bytes
SHA-256: 076d074e4e14691ce4463f5ec168449518b4ae569474cb604d9845214ab9d763
font_02_sfnt_off000109bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BC 17108 bytes
SHA-256: 5b72c34b650613ad7919ddc23fd0a33701c2512c12ee1f220fe4026613abf7dd

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