Malicious PDF — malware analysis report

Static analysis result for SHA-256 9983428a12906902…

MALICIOUS

PDF

82.3 KB Created: 2021-09-13 13:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 62aac6cda33b138615f5b3306e76b00a SHA-1: 71c35cd44ef80bc8df2d0ff67c8576f405e863d7 SHA-256: 9983428a129069027a0c760172d449b81ca82e44b021267e1cd2348da5b5f857
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://salwangurugram.com/files/3872253593.pdf In PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/bipadodozoromugefomibegav.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c01d1d6633---35261292775.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/72359192505.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/duxiradonafujokige.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///35567823168.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nugaduserano.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210902104503.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/navulufaxu.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec43a1d32c---xasatufis.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/a1kl0ohh0d4o9k6s7rsgk7d7da/keduxegiz.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/sozazari.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090920324824.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/sugekogiwaturazos.pdfIn PDF document text
    • https://edusfera.pl/upload/file/77574452858.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/26569591381.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/4587082e906ebda060085b04ef7e96c7/60562408064.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/42886851826.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/30498123696.pdfIn PDF document text
    • http://www.polni.si/Images/files/36922095298.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/17426039617.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=watch+justice+league+throne+of+atlantis+online+freePDF 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_off0000da31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA31 10840 bytes
SHA-256: e358b7ca7f20b790c8a1612e7b30bbedd817ff83480035e5ed1f4bc8fcfba7f5
font_01_sfnt_off0000f32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B41 17944 bytes
SHA-256: 2a4f586e274835be02bbda29d5664060d8d4294b4f3a3cf2d1078899a510b86f