Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab280bd711b8ba3…

MALICIOUS

PDF

86.7 KB Created: 2021-08-24 23:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ac4008e8baa0520e4c5de443be960f7f SHA-1: 78e41573098852fa320e3b94c975f2f47aa8cee7 SHA-256: 3ab280bd711b8ba305f4ac53024abe13651d7bc54b89bc328a65f21287e34045
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicated maliciousness, supported by numerous heuristics identifying the PDF as a link farm pointing to compromised WordPress sites and disposable hosting. The embedded URLs likely serve as lures to download further malicious content or redirect to phishing sites. No scripts were extracted, but the PDF structure itself is designed to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

Heuristics 5

  • 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://laborke.ru/uplcv?utm_term=pet+codes+for+muscle+legends PDF link annotation
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c21277ee42c---25775295928.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/jerunekinikifaje.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b73ac7218a---nuwixufexaxumem.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fc1faeaa10---dofobitovakuvare.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/petuxijegosazavep.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/bipok.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/99e6ef37b25d0b0c29f4da72be90873f/5731915770.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16102f88d8332a---70851378684.pdfIn PDF document text
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/29978405372.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/74401943508.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/pariwikegimamiwupokusi.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/dpiovi7ddirqm42a26llbm65lq/99372794129.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/5fd5e8a47229f41983ab864fb0b8d48a/lutuvakelun.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/23804784460932e77f155d.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/5504341759.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/76cu8cksai5e3r0147a6qfqe2t/pawapikoditupobo.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/50230451912.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d572415051f---98917213365.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/putoxomavuxa.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/39204808965.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/wemuvumexusukor.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/426b98fee7edd184d33ace942c72504f/92053721966.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/91932140386.pdfIn PDF document text
    • http://splogservice.ru/content/file/wukudexivejifal.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/25588660052.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/cb034f2cc82362d168016c4d9cacfb6a/vuwikuwodogimoti.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/tinaguge.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_off0000ed09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001051b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051B 17084 bytes
SHA-256: d14bece3e784d7b60bdd0e3f16e3cbfeac02afd9c8b129b23d50e523f5c115ce
font_02_sfnt_off000131d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D9 10668 bytes
SHA-256: c872ab16799ae48e7f831c24b897f963b55be974f63fc6ecee37e3a6d6d44408

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