Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b7acf7890cda29…

MALICIOUS

PDF

79.9 KB Created: 2021-09-19 23:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 585533121f62de018015d11e162978cc SHA-1: a097576c55247c2aa2a1f348b29c231a78c774be SHA-256: 82b7acf7890cda29d336eaa39e6a5ff2014d838970d8ef3ba061a3da977343f4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF file is classified as malicious, exhibiting characteristics of a credential harvesting lure. The 'SE_MFA_LURE' heuristic indicates the document is designed to trick users into providing one-time codes or MFA approvals, consistent with stealing session tokens or abusing authentication mechanisms. The presence of multiple external links, some hosted on compromised CMS uploads, further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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 http://www.saaegfpolis.org.br/ckfinder/userfiles/files/35000246521.pdf In PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/953k21s86ci4bhpmeaao05t7dv/tadawe.pdfIn PDF document text
    • https://datenglagi.com/contents/files/pebofo.pdfIn PDF document text
    • http://ladna.pl/user_images/file/54918220047.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/74410138532.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/movirofujugugiko.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/xuxuwopanapujo.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/20653308217.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/kejowuze.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132228f1657e---nulosiluvufusilukogikevo.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/fesexaxomufularevov.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161428bbbc3283---fomogofimomukoti.pdfIn PDF document text
    • https://producto.works/userfiles/file/zemakijaxeguxoropezox.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/80091073300.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/97351613387.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/86106298462.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/ragobobaderipiwokug.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/kevafobotegokiwizidumarum.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/83448985841.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/dezogapez.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210909110440.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/xotufeveramapumilurebij.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/17906631449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+do+you+close+a+hotmail+accountPDF 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_off0000d416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD416 10828 bytes
SHA-256: e3ac58143ae44979d959991d0add633dc40ad0cbe9269f8cf7cc02c3fd0cb91a
font_01_sfnt_off0000ece8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FA 17580 bytes
SHA-256: ec1f672088bde58ce8db9694355a1cb131df093b5135a1890833b7b710e8f55e

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