Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a4822fd7ba54a2…

MALICIOUS

PDF

81.4 KB Created: 2021-09-12 10:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b9527d994100f93f26168fe2564b2d08 SHA-1: 87c6066d4d5900c20ca7df1633baaca410e671b2 SHA-256: 43a4822fd7ba54a2cf33b4f1311ab678aab0707812a5edc3607544622323a98a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains or compromised CMS uploads. The embedded URLs, such as http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/c99946kifdkuua82jtr985gqkjdtcsjj/5772570718.pdf, are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/380341d28954bbd1b65209c86661bd1f/gulujinavuzu.pdf In PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/63250899314.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/67299106507.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/tupin.pdfIn PDF document text
    • http://floramarble.com/uploads/rokaxolam.pdfIn PDF document text
    • https://onecre.com/images/content/files/jetejavamuzix.pdfIn PDF document text
    • https://phukienbep.net/media/files/43838497306.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/zomibuwujidemajubaz.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/rojid.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/76058240505.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-2/20210902190823768464.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/c99946kifdkuua82jtr985gqkjdtcsjj/5772570718.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/gebifelixe.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210903160813_1768615822.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/4276650869.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc713231da---sodoxabojawunur.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/71643147482.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/36083226020.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c19d81c3d6---85235361561.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/84192705954.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161301a807cba8---gedejefudosufo.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/pasovinutire.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/zafisipa.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/gebogotowiwusazojom.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/wokorozevelujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=hmmsim+2+apkPDF 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_off0000dadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADB 10016 bytes
SHA-256: df76c51ebc046a8801926fecd6ef427992ca6aa235be7d41f9cf4d43f20f3810
font_01_sfnt_off0000f108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF108 18132 bytes
SHA-256: 070601e03a56c88ba20ce77734198db27bd1fa5a0ff9f3319cd6b7cd92494851
font_02_sfnt_off00011fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1