Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d10f3a64d6967e6…

MALICIOUS

PDF

77.7 KB Created: 2021-09-09 00:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a7ad5da2f72a67aa2a4d64c8e1d2aa8a SHA-1: 48c7a365059e386fd31dca05ca7bb11ab08ea2ab SHA-256: 8d10f3a64d6967e619cce7c69384ab918da390c1ddbf153721b5be6ef0ca3fcc
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised websites or disposable domains. The presence of numerous external URIs and the 'link farm' heuristic strongly suggest a malicious intent to redirect users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://durimawar.com/contents/files/45554334897.pdf In PDF document text
    • http://legalinet.eu/userfiles/files/89315892982.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/zakul.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/2431722312.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb0ea26c2f---jozejawabilowolu.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/37797193434.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/13608813749.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/xolubobokanijudozifozo.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210901121240960257070.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/tofonibubafakadizowesad.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/jubara.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/51936860674.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139253d8321f---17852379395.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/gukopamozapabomedu.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/98188725789.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/sowuwoviju.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/dc9f60874a90897bedfff43838cfc7f4/14464811058.pdfIn PDF document text
    • http://vo23.ru/upload/file/diduju.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/98251915660.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/80426947759.pdfIn PDF document text
    • https://verner.lt/images/files/gavum.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/70184302704.pdfIn PDF document text
    • http://irollee.com/userfiles/file/wilazobofepajarilela.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/1bdd792c94eb303505d1cfe324341b1c/wiketugunop.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/sowip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=my+phone+specificationPDF 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_off0000ccdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F4 10536 bytes
SHA-256: e3205f734b623a1609c64bac31e6797f6191e457a246d93c9385139855bd4dfc
font_02_sfnt_off0000fcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF9 17160 bytes
SHA-256: f153b981dd8d3426b307d5f4e849902bf87d4478aa6a1b27223ca5e1cce16fd8