Malicious PDF — malware analysis report

Static analysis result for SHA-256 76107fbfcc073fcf…

MALICIOUS

PDF

70.7 KB Created: 2021-09-04 01:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3e55790d49d1af35fc2eb78bf19ca310 SHA-1: cd38a7daecd7a8fd62e6a794c9a68569522f9d49 SHA-256: 76107fbfcc073fcf0fbde980d8ca46734d0ca929ca79d7c0cfd29149e2034ad4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, potentially leveraging JavaScript for obfuscation or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://coretry.ru/uplcv?utm_term=characteristics+of+constructivist+teaching+pdf PDF link annotation
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16082a63394723---93018080976.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/b379f8e3c489ee9704dd826ef1bfbf3a/rojakasetelowovapupov.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/54864005646.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/54199609176.pdfIn PDF document text
    • https://flyfinz.com/userfiles/files/51176608378.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ffdd4ca4a78---65359870470.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/2070143885.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/90309591276.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/1lc8qmkmj25fcc3upga0vo6kpp/17301955192.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed01c9b7bc---zadaxalatodo.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80696bce99---zomurusani.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/riseb.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/xorupuxofe.pdfIn PDF document text
    • http://maksimetall.ru/files/xiwedodusevazukovizurov.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/vukitepatamanevat.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/20310705134.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/wepozobugapofekat.pdfIn PDF document text
    • http://chamdure.com/DATA/files/90072672709.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f98b16a16f---26427142510.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/63350278559.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/17280298636.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e043132013---zubomi.pdfIn PDF document text
    • http://foxadv.net/file/tapevel.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/lenufemisod.pdfIn PDF document text
    • 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_off0000b71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF35 11048 bytes
SHA-256: d3b6204fb2e62ee8d9688908693b89b956ad26b1f13c1b680fd39a87cfd2de48
font_02_sfnt_off0000e8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C3 14480 bytes
SHA-256: 715eefd600c45f064cf874545de8389c07680529f2e353f2221880b874ffdb9a

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