Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f10fa13d5a332fd…

MALICIOUS

PDF

92.6 KB Created: 2021-07-16 19:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: be41726d920485a742945ebdc9ce5ab4 SHA-1: 8fe23ecc1617f29246de5717828565ed1101d990 SHA-256: 3f10fa13d5a332fded7a9cf5c32e2fc734b98b0e3ec2c8f5494d345e0b606b89
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607273f278ada---88655310788.pdf In PDF document text
    • http://qa-whg.net/upload/files/lumarulefulizupasexitar.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078facb9c03b---88304548299.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/rowin.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f05021de7a3---29540959203.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/lazakokesijugarizuv.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/podejonim.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/26815516656.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/006bef3672f4cab53f55e6b9af41aeae/sofomojegikivakopoker.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/96d40c8be5ca2f9d6d576bd9b985f9cc/68179101024.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1620547920.pdfIn PDF document text
    • http://ippon.lv/uploads/File/ritulukaw.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/42754015780.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/jqbfs7a7v0hcbas1us1svsj9ej/87456713432.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/26144949756.pdfIn PDF document text
    • http://allasclub.com/campannas/file/69427085897.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/57674809899.pdfIn PDF document text
    • http://royalgroup.at/tmp/31572485816.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5d9327be7---69711387372.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/24010970147.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4bb517b5b3---84618666774.pdfIn PDF document text
    • http://apvn.info/userfiles/file/17566507604.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160935ce927ead---golubogebovijixali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+use+xp+tokensPDF 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_off00010612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10612 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E24 18936 bytes
SHA-256: a31034f67f95eccab8cfe6a113963aaa72d5d6d1dd15f7e1c8b619f8fa1529b2
font_02_sfnt_off00014e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E01 10216 bytes
SHA-256: 745e09b297fd936782c7faf4e9c68a8092c5afc32f8729bbfd79cb4ae3fb3e80