Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbcea83ac1325cf7…

MALICIOUS

PDF

77.8 KB Created: 2021-09-02 22:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1c4b5e1175b306b96afb729eb4fe8bd8 SHA-1: 81e4f7e482e0254c97066f06cd5bebeb08118092 SHA-256: dbcea83ac1325cf7b8a97ddfbd8c6322d536feeb79858e42cd9d30c41ac4f0de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and the heuristic firings indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/tubat.pdf In PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de030d2e72---14261997121.pdfIn PDF document text
    • https://network-italia.com/file/fodumigoniduwegijudak.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16121c68e30a1e---90681193154.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/bomogodilela.pdfIn PDF document text
    • https://go2germany.ru/files/file/17147069649.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b28e7d86cbf---xikilig.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/gosemulebekinefadoduvamal.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/62359066205.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/lonhuab0dd3lv12ghn5omolnn2/30374576113.pdfIn PDF document text
    • http://superpart.com/files/52509666376.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082786631202---67930597443.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/pezezuxida.pdfIn PDF document text
    • http://www.heksan.com.pl/file/tafururamurexodini.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607839149f6b7---1103419443.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/0j7112o74gv0eca4ck7l69mfcs/87109289273.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/nawajo.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816bf9506db---41905978521.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/15825948057.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/b3e23bbc0d54cbc1190eccd6f1b82ac4/merebefasariraginuweku.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/dabezawilixaraxob.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/jutilorewol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=disarming+the+narcissist+free+download+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_off0000c81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81E 11156 bytes
SHA-256: bde295f6eff74b618341f24ccb741d28a149e83bc7779332250359eac7412b02
font_01_sfnt_off0000e1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D2 18432 bytes
SHA-256: 74db3f3c960677c677a5c130bdc7b8cc60faea84916c19d579cd88e89d1f9f1a
font_02_sfnt_off0001118c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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