Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e6565534c0e1ed…

MALICIOUS

PDF

97.4 KB Created: 2021-08-12 10:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d03f264a88e060260c221e06248dfb73 SHA-1: d76f046cbd0d52f23dafadf4a81bc42cfab55e96 SHA-256: b4e6565534c0e1edefc800271a5fd1ce4313721f555d5b75e4b2a026ed49eaee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm, likely intended to redirect users to malicious content or phishing pages. The embedded JavaScript, though not fully analysed due to obfuscation, is a common vector for further exploitation. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://synerhu.ru/uplcv?utm_term=gm+syed+books+pdf PDF link annotation
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/1551fdb11b342f37f875700bd3dd829c/tupipiregabivojolurowur.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/72427655767.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fabd7c97123---43323463261.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/15345675031.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/s44b9c3fued9233oguotdct100/mirewomiroronojowabivebi.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/91986658910.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/33170079768.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/55ulvapeb392epkorggf1b9m4m/67643269300.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16075af969aceb---mixomawusuraxutonetijew.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ckofdpd69h285itlfeoc65gpc5/buzobalosojubuxo.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/91839573583.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/b0caae3427c24f55807cdfe590ab3718/xoxaxumikebujoxi.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a639cd2d9e0---89799367858.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/71828385122.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/37893196231.pdfIn PDF document text
    • https://flyags.com/editorResources/file///depudakolodunalufazuf.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9d3bdcb09e---nefilovelezir.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/69178999147.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160944378b1a3a---86222231806.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/43604740307.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091da1450d9f---tajevaseni.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021721968574.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF681 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E93 17440 bytes
SHA-256: 3706470e59ffd5e04920b9e06270081c0c2a22043c6137b33ce6032870c13363
font_02_sfnt_off00013c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C61 20760 bytes
SHA-256: df57f17206f9de95c2a2e7c3325706b827269a3a329d5c6b695579a22962afd5
font_03_sfnt_off00016025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16025 10440 bytes
SHA-256: 0f5da112222883826bcbc831a42932f239527fe71ca0e02816ff0e40808edbd2

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