Malicious PDF — malware analysis report

Static analysis result for SHA-256 481c8146f21824b5…

MALICIOUS

PDF

90.8 KB Created: 2021-06-30 00:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 82dafd634c3cfe360369c37115ff078f SHA-1: 4af922dc46e7d8af8dfbabc76ad63742aeac49b7 SHA-256: 481c8146f21824b51c25069b347a505616f8c405168aa991bec9f0c1d1837750
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external URIs and is structured as a link farm, with many links pointing to compromised WordPress sites. The presence of external URIs and the link farm structure suggest an intent to redirect users to malicious websites, likely for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://wastran.ru/uplcv?utm_term=baby+shark+piano+with+letters PDF link annotation
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/8312221e4467f9c87063c47a07aa3767/76168821610.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c54f985bf---98386258344.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/maxipazilonetaminixe.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/a076fd6277028e764ebbe37f98623cb0/zatewipolatijo.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4b0da2c72---kavabe.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/gerosexupabotabufe.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8d4e261d0---gulowaro.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/guzikipolefu.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/f55f3a352ac100fd6dceed5053641b83/bamosasolufesapubavamewix.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/gofexiroxogutil.pdfIn PDF document text
    • http://www.toptehnik.si/images/nixiriganegimapolanivaj.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6e4d5edf1---getev.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608319e9e6be1---31332129674.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/bc365275a5678718cd20102994dd76e8/49814171342.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/63280628664.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab92f4de647---86035296089.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a79658ece72---sekajebifitotofajebomesir.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/5237da39c66f613e2117e2fa9968f7c7/budutogoposufurete.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/guzizo.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/vurenixuded.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/e817ab5fe113586469b6528e54662a98/daperurezusapepowefibixok.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/fadowebibexopewovosofef.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/8et4o4utlasadsgb6ko8bej7n8/11510126880.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/badizimekifokexojuzek.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 18976 bytes
SHA-256: c8fb232d569dcac42b8e350a12eb982058832cd1b10ea074c1cca7083301ae44
font_01_sfnt_off0001219c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A9 2452 bytes
SHA-256: ce48341ef06f1b29fa5fde9f85399c5d2e0794a16fb6df83a217e146d338a080
font_03_sfnt_off0001447e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1447E 10836 bytes
SHA-256: 46766a8bcb3c53b2a5766b61b5a2c92a3b49fd2a6592ccd89c9042f0e777106d

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