Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf38b61f035a83b…

MALICIOUS

PDF

86.2 KB Created: 2021-08-25 01:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d46758443b6c86f929a11563a0fd9349 SHA-1: 2c89e0918d128bbbc13547c6ef4262858266b5d2 SHA-256: acf38b61f035a83b23e83dc9c6a83d69141b6c9d4956004378e2929af8b2b8de
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains, likely for phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://crysiq.ru/uplcv?utm_term=what+is+a+client+service+associate PDF link annotation
    • http://szzxwx.com/Upload/Upload/file/202162735466957.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/8843f6a82f4744e083aead5c2e985f97/6632485568.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c7bc67adb---46077811432.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-7-4/20210704162224201208.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/5655913664.pdfIn PDF document text
    • http://merwepizza.com/upload/file/21426891196.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/74723757355.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611e45930642e---16273888300.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/60854953638.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/85559346020.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/xuluwinifatagel.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/8291576642.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/f15558acc1293cabe1d4e36fbff08a83/doburagezuwaginezet.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/kipepuxaxojolefal.pdfIn PDF document text
    • http://blatt-gruen.ch/files/16003079646.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/brmm5cs9i5170g5nj8782pdvuj/87018878165.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735665f15af---45651596982.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/49202696370.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/70153912097.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/xujuwevo.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/makepaxejinemegub.pdfIn PDF document text
    • https://codecs.ro/images/file/78775538218.pdfIn PDF document text
    • http://ridendo.cz/files/file/16311885014.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca783246d5---fosevozevejukuzoj.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_off0000ed2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2E 10384 bytes
SHA-256: 63017f34cef0592d64e1ffe6911db75e35f33ff09defcf7ed53c5737f9e9d9aa
font_01_sfnt_off000104a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A7 17248 bytes
SHA-256: ed96b12807350b82825b8c7ef28e6666b91dfbfc346bddf7c63643a672a74364
font_02_sfnt_off000131ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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