Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a19f041b72648e6…

MALICIOUS

PDF

80.9 KB Created: 2021-09-04 03:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8e5abeb2fff20438a737c4ed66d763fb SHA-1: 336fb3bff58b31ed9dc09fe6586717c38949e387 SHA-256: 8a19f041b72648e6ba41c859ede15fabfd55db312686c39bf92041201ee01eeb
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites and raw IP addresses, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of embedded JavaScript indicates potential for further exploitation beyond simple link redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://originalcheck.it/public/img_admin/file///zopiwasogivuzejetu.pdf In PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/xovav.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/49614853680.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/av7a3b9d0vfrkan56pf651arf3/19498192900.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d55646dbc---zigusunimazotekefoxo.pdfPDF link annotation
    • https://pharmawell.eu/ckfinder/userfiles/files/49854533532.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d66a4d2ff5---nixunadigowebele.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce87eadc6f---vikupewo.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/vguh38kaaccodqhqmggklrp4lh/benepexagamotazilibodi.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/063805884fa9572f520856112630691c/degufogudupoxun.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/wipikosoluvabufes.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/9605552261.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/66450986900.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/53087119587.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075a8ae4e7a2---66247554901.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/62599460810.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021071718155670554.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783580d9589---parajogadi.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/vizobarebugiwowi.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/bejomutekenagu.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/niwimo.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/62603449183.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/zaxelaku.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f8890c85f403af1970e3b89ab3ffb20d/43002352060.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1610a67927530f---76181243005.pdfIn PDF document text
    • https://isosklo.cz/uploads/zupokilasirapemabotikuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=esl+mini+debates+pdfPDF 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_off0000d9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E6 10560 bytes
SHA-256: 523e26f94c760f7f476fb7e74f1f60d7115775e3d356c8d80527248631fb6310
font_01_sfnt_off0000f1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AD 17176 bytes
SHA-256: a4b90a62f3fed7762d35f0b3458d08256eaea20d609bd9d1182685bb34109867
font_02_sfnt_off00011d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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