Malicious PDF — malware analysis report

Static analysis result for SHA-256 9702c138a4d15d28…

MALICIOUS

PDF

86.2 KB Created: 2021-09-05 11:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0646f7d1b045f7aac8164424e987b055 SHA-1: 2dfdcf87ed1d4a5661935ea25f3ee5bc51d403e0 SHA-256: 9702c138a4d15d28b0bf4a6036beaace6415792dd0e5e58502c82642076c27d2
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 compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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
  • 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 https://alate.org/admin/fckeditor/editorfile/12954312455.pdf In PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19802804613.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf92149f0f---15996356295.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/minafodi.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/kupevujipafik.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/rukikukom.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/muxulepumexuwewijoligoj.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/zitozojubug.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/miverijazodorasazisulud.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099aea5c5e9b---29949457025.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/60597771768.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a11916d1611---pakivonatejovokazebiroleg.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/febadojigezujagedagu.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbde32deae9---dopoxidagutuxani.pdfIn PDF document text
    • https://ka-base.no/images_content/file/47459633370.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/1640306278.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/30813430990.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/juvazexovegofineketibe.pdfIn PDF document text
    • http://4yoga.by/pics/files/93832105391.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/58bc03c2b9557ed15a0ac167be66bc3b/82118929591.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776e94f068d---boxosepolatatozi.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857ea80fb82---lodeguwevibume.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/zoparevatuxiko.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/81136051129.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/surulininufetofovikufelot.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/8ae014525c38315da966ad3c89144977/28627779974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=molecular+techniques+book+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFA 19980 bytes
SHA-256: 1c522e6d9c8e651f93995c85a6653ef3ce13a20f54d13612aae974b02a9a28ee
font_01_sfnt_off00010268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10268 16284 bytes
SHA-256: 65dfad125546efb8f2a71f825911919546a9c7e51d723d910fc09019f6959011
font_02_sfnt_off000118a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000130b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B8 11188 bytes
SHA-256: 24413dd0097d4bcff899ccb5dd48b047d4c28bd3484a5665ba25495576b0c59f