Malicious PDF — malware analysis report

Static analysis result for SHA-256 128226332e5af474…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 13:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8db3f05b22449c528d63d5b4ae599700 SHA-1: 7b3091d39dd3703ef0460e470231ee3ffabae87f SHA-256: 128226332e5af47460b0a7319d6b67506d66a28734d6c6e99cd5e441539ec976
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The PDF also functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to obscure the ultimate destination. These elements, combined with ClamAV detection and ML classification, strongly indicate a malicious phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://catamma.ru/uplcv?utm_term=ionic+compounds+worksheet+middle+school PDF link annotation
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/vebunegegikuximegiwotutu.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105746270494---nuposirikesoturexuko.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/71273510104.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f85debe610---44191495114.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f44b0631fec---ragivob.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/warese.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/borefujilatigumokafoxaka.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/67285036735.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fb9b8c334778e06c457e1d1a7d4f1bab/95801138094.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/86c56ea734723e1fca848f6503d396f4/xizinalinut.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160759ca7eb864---lolifu.pdfIn PDF document text
    • http://deltools.com/userfiles/file/jebarufo.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc94388217---zeneraditutanasukux.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/90610960157.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160de60c587c97---18075099183.pdfIn PDF document text
    • http://xycrusher.com/d/files/xovefazufomabidesawifusix.pdfIn PDF document text
    • https://ahha.az/userfiles/file/85940687511.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/xuwagasudoxodosuv.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/piwimugujutopalopisoz.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/45bd12530deda7dfd52032311d4f81fc/94363963873.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/piroreza.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/071883038d2dad021405dbe37abbc533/vivegaretuj.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c6a4e77ed---kefufovusepegaxik.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_off0000e360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB77 10844 bytes
SHA-256: 3be2458b1bcc0817497e7fe521b31da383085fdd8e7f1520880dad679546ae0a
font_02_sfnt_off00011459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11459 17536 bytes
SHA-256: 1d5acd4143d917d457ff36f393776c3cb536d66aa7ac0d6f386e7e54aa0c25b2

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