Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a294e158ee2e78f…

MALICIOUS

PDF

85.6 KB Created: 2021-09-17 04:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 10d17716e6b367400f55d39215ff8e49 SHA-1: ea947390d4c31772aff275a508eb47c907da7cdd SHA-256: 2a294e158ee2e78fd33c43c8a0279d625638ce85851b8b208da17767e3e38839
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially compromised or disposable hosting sites, suggesting an attempt to distribute phishing content or malware. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://khachsanmyngoc.com/upload/files/doxutufi.pdf In PDF document text
    • https://protum.se/file/51046549516.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/15034500148.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/wokiwaseja.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/melifewurasuwalawixuzuwet.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/19638487549.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/29500837254.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/80850729845.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/bivivo.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/56209878698.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613df89e94a5e---16419570850.pdfIn PDF document text
    • https://istanajp.net/contents/files/82297318143.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161386bc45c5c3---zogirexumaxaduzus.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/58527569627.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/jiwatexakokakuv.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/19810732656.pdfIn PDF document text
    • https://theurbanthinktank.com/files/zujubikoboliruzan.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/62c3c60e5cdf98bede8aa9098882164f/44673091173.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/vumukuta.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/1de95545f5effae2d366551a495e72c3/gufejepasokatuwe.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/bikekafoma.pdfIn PDF document text
    • http://slsnn.ru/content/files/41069086649.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/mexib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=root+redmi+note+8+pro+miui+12PDF 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_off0000e10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10E 10704 bytes
SHA-256: 206f618bb11151cbfa79be34d1a0c9b7cf823ad3cc677b85d1e75138d20e6863
font_01_sfnt_off0000f9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BB 20928 bytes
SHA-256: f12b53a7acf2b7e33893740172d955fc79e49efe6325e878807317640c2f23da

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