Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ad4cf680545782…

MALICIOUS

PDF

81.4 KB Created: 2021-09-01 00:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 923c88bf5382ae0b2da6a385250ff3ae SHA-1: 5c4957b36acf0187ddb732c7a0a0cefd435d7a81 SHA-256: c7ad4cf68054578225e98ebc11df15dfd40186aa5f5b6bebe33cc32597ec70c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm directing users to multiple URLs hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/21ca70d8f5ed50d74e62d1debfa4cf4e/xalebofob.pdf In PDF document text
    • https://bisnismedsos.com/userfiles/file/56252342727.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/8bfcadc807c319654ce0cc0482fc0106/67405490454.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/627a0cfaf4076055881faec4e2099a0e/13408244490.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/nafavibilekozatav.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/linijowefojinupe.pdfIn PDF document text
    • http://teknis.it/userfiles/files/pokokijuruwap.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/zejaritaparitopilibu.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/6m4bnpeq8tvcmq1aqdglcf1gk5/11250214744.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/584a9baf72faa99318a9ea5abbc3264c/72848523600.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/49282509357.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/64162958619.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/luplpt786h2qu38mm1e4qkk19i/bugutogezuzuvumikolomilij.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160920182f2569---gizadibuvapilatutidigepip.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/s746jddus78pp24nm8k1d8l0pd/5873443135.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/38227870410.pdfIn PDF document text
    • http://benhvientantao.com/img_duhoc/files/todazodopuwerunilozopot.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d736726f12---kugemisufinuxakutegipi.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/25738653684.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/431a5d3825b176208922a75c8e3f361d/nujanamonamuwanivipo.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/wenuge.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeea09dbe3---77195703908.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096702f22eb1---45759932277.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/de2dfaadc39d35c84ca9927438bc0c35/doxivoxufulowuzadito.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=relativity+meaning+in+businessPDF 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_off0000dbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCD 16088 bytes
SHA-256: e5990fdc13418c91ee92b51ba5743cd9d7ee8224780c6e178e65e43e682cf75a
font_01_sfnt_off0001054b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054B 10696 bytes
SHA-256: aa4dd601d2f79cbcc8e62da4b05f0c84eb0f8cee9515844e742d159ed1478990
font_02_sfnt_off00011dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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