Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bdce1de4e93b943…

MALICIOUS

PDF

86.6 KB Created: 2021-07-24 13:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8e345659337da0ef2289df458067357d SHA-1: 73c3307047f6e6e9eb5ff1cf1b4e6535a33c51f5 SHA-256: 2bdce1de4e93b94386c5ff88ecc20ef82574ec633c212425c4e21dc81a93d2a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/40545b0bab9d8a6569117415875c5969/19568890082.pdf In PDF document text
    • http://al-bandak.com/userfiles/file/rekaga.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be94fa651c0---19320874668.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca3901ae84---27784445591.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/c1cb631d09c44e9cfef986d85a3c8ef2/9879364907.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/sunutifapamanox.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/e02da68788287b4bea3a002c36071e8a/23775268784.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7cbf7b630---bonavuveronomosowigeb.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89047965311.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbce5e075f---27482096444.pdfIn PDF document text
    • http://dancingstarsgreenwich.net/clients/1/10/10f73e4104fe6082999c9b722aa65ba2/File/71015535860.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160877d0086543---kuwataru.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/31827939423.pdfIn PDF document text
    • https://baongochoa.com/upload/file/zikegufubovuxerozumi.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/b0lf3kfnvb6r22ofqvepjtds66/76016230702.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073b4cc9b131---pijate.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/verarubororuga.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/jakovewepimiwozobuzud.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/56412137260.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/80099279762.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/tebosiva.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/pibekurigunatebifasoriv.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/jevixepivepurapopituxe.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fea7113ae3---91217186540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=dodge+ram+owners+manual+2018PDF 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_off0000ee2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2E 17072 bytes
SHA-256: 6134638b278e06f61506118f5a79c59492e715816c98c13664dca0752dc2ed04
font_01_sfnt_off00011ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB0 11088 bytes
SHA-256: e41de547a7081acb2006f1d1fc0dd79aca207ff36520f974f325b17b841072ad
font_02_sfnt_off00013477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13477 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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