Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16ab22a43d53f0a…

MALICIOUS

PDF

79.9 KB Created: 2021-09-05 03:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a8a74162d89c0e6343e9742c13542b89 SHA-1: e35e137492fe7f4cbfebd966757304da084a10aa SHA-256: d16ab22a43d53f0a3fdb276b44f4032e6a0000cb1b9622ee4d5f61114316d49a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The presence of embedded JavaScript and a link farm pointing to various domains, including compromised WordPress sites, suggests an attempt to host malicious content or redirect users. The document's structure and heuristic firings strongly indicate a callback phishing or tech-support scam, aiming to trick the user into initiating contact.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://eliteplacementagency.com/uploads/files/mifusegixokotakavosu.pdf In PDF document text
    • http://vogiantinhmach.com/media/ftp/file/22026999757.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/movufamobuvewune.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/dirid.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/km1u1akiqplajfsmb93gfacccb/ramezejagujimov.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160791dc4304d7---subeteposiwuxawosili.pdfIn PDF document text
    • http://dnepropress.net/files/file/65882725573.pdfIn PDF document text
    • http://kappp.ru/js/ckfinder/userfiles/files/81375514785.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/301155586824.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e5623f102---rekazuzowo.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/26741315008.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab1ed96499---44438818955.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/wijiku.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/konosel.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/42855003530.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/19383233848.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90910923938.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094c1fab6994---37699603537.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/vexotol.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/30523523085.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/sexarebepivisazu.pdfIn PDF document text
    • https://egca.fr/userfiles/file/wumemiwegonabupuvata.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/d05067ab255c71c0dfb1e9fb8a8e5081/lidavudapigabexopibi.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/9323741483.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/97443817990.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=vincent+descombes+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_off0000d032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD032 18796 bytes
SHA-256: b4912871f258a9ffa3906846c39167ed769629be06a880e4c7e57bd6e38eb805
font_01_sfnt_off0001008a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008A 10580 bytes
SHA-256: 6e4f0b89451a6fcdbad8c047403647364dff98762534b16313b8540e9370d6c5
font_02_sfnt_off0001187b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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