Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4ed4408e8fe58c…

MALICIOUS

PDF

77.6 KB Created: 2021-09-04 05:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0f8bd39ad90412f5dbcbde26f3d8e2f8 SHA-1: 9a88db534316d8b3580486e45929fc85f2cbd2c2 SHA-256: db4ed4408e8fe58c61e72bca69235f049c4eb64454d5e51c2f4bf094fc6f990c
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains. The primary purpose appears to be redirecting users to potentially malicious content or for SEO manipulation, rather than delivering a direct exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://gamedunyasi.com/calisma2/files/uploads/80531976930.pdf In PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/3f6e6059c08510c7a4d68b8f780c5e52/12410528246.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/88710469099.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8f3a7d6bc---23620638376.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9789d8eb4---voxulakigigiri.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/23215809900.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/24831778018.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/213bda9cc9786dcadefac54e3a2b79de/rekuninevasikowum.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/lumedosanovomibikiper.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b946efe4a5c---nenukenonukewo.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16084a86581bc4---redabukubimifodef.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/88215250911.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/sojodizajotewenudekopifuw.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/62036269657.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/jits6r02f1kkjsfhd6uko0qtm4/50010689828.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/36957581333.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/25981781905.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/dabozemijagibave.pdfIn PDF document text
    • http://cissi.it/userfiles/files/60122575578.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-27/20210627055254931186.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/pozufenegedudotoni.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/u39pa8nucdee710cv8745u8484/87003629216.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/48633529946.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9608ddd5514ac3b42d284bb4ec28ab7/83245380286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=sonance+mariner+63+manualPDF 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_off0000c8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F5 17840 bytes
SHA-256: d6add15ab0835abf45bdc04e44fe001135ed8aa996fe6ea283702e245130409b
font_01_sfnt_off0000f754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF754 10640 bytes
SHA-256: 9a6e7ec993e81969501ce611b3f6fd9216b700d59cdfce63bbc27116999166fe
font_02_sfnt_off00010fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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