Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f6ec16e953e60d…

MALICIOUS

PDF

120.3 KB Created: 2021-09-03 21:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 359219ad1c3eee41ea5baa9c33ac01f4 SHA-1: 3aa81c9246e6ea1989967c7031135c40d7a4bc7a SHA-256: 66f6ec16e953e60da8b989e48bc6f76b66eec1d6b161893ff27741f48fef6943
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These links are likely used to redirect users to phishing pages or to download further malicious content, serving as a lure for potential victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://laborke.ru/uplcv?utm_term=japanese+language+history+pdf PDF link annotation
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/cc5a465f34a497883357bcda6e7bcb58/10733863696.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/bodkplnu6o24uqrl2vc3388b33/ponidifuwosave.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/2288529527.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/89648602367.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8a491b0f8301a178a6172e1c20eaa169/76358699622.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/42238289520.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/sapabajufifevuladefiw.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/1efe653358f484f9bdef978ffa378f29/53375511670.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/46792808361.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/80042925389.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/4592750038.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/68791892529.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/4d172b81f29c275567bea9250fdd2405/dolobosejubufoz.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/19dab11eebc0b56cbd5b4916475a7a2f/19839850346.pdfIn PDF document text
    • http://sneedfamilyct.com/clients/44919/File/37430012887.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/0e46d589f63d59e1aa295610545ff319/dobipojuxon.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/pelavoseput.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/5bf8228adf37c5234ba9843c5a5f5851/tosikujojuzonawenoxap.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099ba0c46442---24766317536.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/20774607434.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/8af9e6bd2a7771fa90434669af4f3898/guzesegov.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/319196246.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jct3i5u1b64fjaurg70hrmoiu5/12694615068.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_off000164ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CC5 10980 bytes
SHA-256: d7b0a0f60e846a72ce742cbf9f5f74f7e484a62dfc047fd359ddd909047d1b94
font_02_sfnt_off00019602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19602 23764 bytes
SHA-256: 0c0b91f5a17b4f37fe90cde8f4961317ef6120aa539c6f91a7185c2a1609bb77

Open this report in the interactive analyzer, or submit your own file for analysis.