Malicious PDF — malware analysis report

Static analysis result for SHA-256 29f90b52ca382444…

MALICIOUS

PDF

100.7 KB Created: 2021-09-15 06:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9080153ec5cb813cd85016847e853123 SHA-1: fa07d6b0e83a7e090a6ff8a441441e2d38c05d20 SHA-256: 29f90b52ca382444ce87dfa4c9fc4feac12860c31ff040799147d3a6a8855d68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9853

Heuristics 7

  • 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.
  • 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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7a7210b44598f76cba09f2cee113273a/vatagedatelotipefepaku.pdf In PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6b4302e35---semugipuzokapusexaxe.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/lerumexuposukono.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/kebaxujijisiziwexeza.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/sikaritilumoxalil.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/dojonekapoboxexisesupawi.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/2fe6e99beb91377d51a4dcdd02a3bace/tejujidudifebokomij.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/pujibibobon.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/20659624186.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/1524932973.pdfIn PDF document text
    • http://exim5.hu/_user/file/30815773799.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/62872328457.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a145d4aa58---wafefamuwezebemo.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/88801694112.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/19507591841.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/modubibuf.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/32656047559.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/kidefixolip.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/zifijuxesan.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/76744700140.pdfIn PDF document text
    • http://sinoorchids.com/image/file/burusef.pdfIn PDF document text
    • http://cocoal.com/uploads/file/28650637724.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/10444412215.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45042166747.pdfIn PDF document text
    • http://standdominica.org/files/files/tipinodep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+intentservice+examplePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C8 10824 bytes
SHA-256: 9c393a964ca39e41725fdea2fa99066a35346268bff90ad3413a2d1b3922c5ab
font_01_sfnt_off00010dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC4 2084 bytes
SHA-256: b862109228214adc4839668d56e98ff78895c1420d60d65f6589c1bf7597fd55
font_02_sfnt_off0001173f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173F 25024 bytes
SHA-256: fbbc9b9e2fac0bce6270ab9aa353f1479618ca641492d19c313069f6dcec41c0
font_03_sfnt_off00015605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00016e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E16 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1

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