Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d70735f866bcb31…

MALICIOUS

PDF

85.3 KB Created: 2021-09-07 11:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 647998ec8ca1a98cc023596cf74c3891 SHA-1: c03ed9eb3c8b05d5538e2197b3e3aba610e1b8c7 SHA-256: 4d70735f866bcb3115d34444363610d4da2f17fb62031fc5cce84343f06262da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, containing numerous URLs pointing to potentially compromised or disposable hosting sites, suggesting a phishing or malware distribution scheme. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jullien38.com/ressource/site-image/files/lulavoxobigupaf.pdf In PDF document text
    • https://flyags.com/editorResources/file///21734002089.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799afac46e4---25532183476.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/fexulaz.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/86679307969.pdfIn PDF document text
    • http://belhavenhighschoolalumni.com/clients/13962/File/23617678327.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe555bd3e1---49097649112.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/7451797803.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5635f3cba---84158509864.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/dukidusitekefum.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb67b60204---7017490611.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/kolejaxokisunufegexogiso.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/vikipasujigikafivina.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/7237129228.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/tiferutadupelipu.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/n68jali1htk9s05mvtmg4cgi2q/18053577971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=arifureta+light+novel+volume+3+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_off0000e104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE104 20568 bytes
SHA-256: c03604c64daf901d0810a2526a0582b22d764fab99fff4e62dc7f500100ca8ab
font_01_sfnt_off000116f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0B 11096 bytes
SHA-256: 164c5bafaafd8c260cef7d4425b04e3aea76502249c90df18f2d8e166f426788

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