Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad414c155136f330…

MALICIOUS

PDF

84.1 KB Created: 2021-09-23 18:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e69ad93f74ff7c407b9f892c2dbca190 SHA-1: e693a239486fc6ffe518aeb0006c627c5fd07c23 SHA-256: ad414c155136f33046deecb254ccba192aa58cabfa90a0bbac5692502981ac6b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of JavaScript suggests an attempt to execute malicious code or further redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://maiodi.com/userfiles/files/25266063654.pdf In PDF document text
    • https://gifarlcm.com/upfiles/editor/files/jabipafetaj.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/42408435545.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/80416140019.pdfIn PDF document text
    • https://hgb.se/filer/file/78497937024.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/nulazidazefutowusix.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/wubadugajakafeb.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/jezirifuged.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/43537432329.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/rewudinubuz.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614870cd0c4d0---gudoma.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/55834839845.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/pobebuketatibixituga.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/gimofuluwiwusedaxofawa.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/90100970414.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/waxatovowitipizasa.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/34as3dtk8ahlsfnaafelfe36ij/52297184858.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/c8cf608484a82956b267779cdde27dd0/67602967350.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/3399697417.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/lorofuz.pdfIn PDF document text
    • http://hbaoge.com/upload/files/85315220334.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c1b8c5ea05---kuwanemeworotumobapexuk.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614af2ee5c93b---xawat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=micro+sd+apkPDF 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_off0000e43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43F 10212 bytes
SHA-256: 34f0c460a67fa85ab28ab36ae46f791ee33d5d653a796120a33b9cb4eb84a0cf
font_01_sfnt_off0000fb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB48 18196 bytes
SHA-256: 524322d9ab6f99c029b5262f884e0d692f38e07ccfba37cc2d8f9ab45452e67a
font_02_sfnt_off00012b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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