Malicious PDF — malware analysis report

Static analysis result for SHA-256 03754f43c1da6fbb…

MALICIOUS

PDF

83.6 KB Created: 2021-09-15 20:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: de70f71d7e0fb1c43ec65e6e37409898 SHA-1: b7582c34d3bd5179f5914f12fed9f56f0e15164e SHA-256: 03754f43c1da6fbb86221bb460a9818bf4fad559512c77bc7704111053d70415
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or compromised. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such links for SEO manipulation or to host malicious content. The ML classifier strongly flagged this PDF as malicious, suggesting it's designed to redirect users to harmful sites, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://garglob.ru/uplcv?utm_term=odi+powerplay+new+rules PDF link annotation
    • http://asia-test.informacittadino.net/media/files/lidozerasapibos.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/1807073890.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/42602551631.pdfIn PDF document text
    • https://henuopack.com/d/files/misiruz.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369b31d946e---93687577527.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/fujaxagonetegufekugezugev.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/45285283007.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/20452345509.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/63420290794.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/11337484894.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16132e60db97be---50524145946.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/47957106592.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/tokuzujixafawobapuzolej.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edf12ee16c---wiwatudo.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612eab4867397---38428616256.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/53974434041.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/ruxitokademuz.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/zewosijeg.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/47832147668.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6aa63ec88---wobobavidovibimegoxoge.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/81186312699.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210915113004.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/34864537214.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/dexibuviruxedu.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/4196384634.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_off0000e128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE128 17912 bytes
SHA-256: faa783f9ff59e4d53470c701b2809c37c70e154507cede4b4b2cd89a5b572bd3
font_01_sfnt_off00011027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11027 10612 bytes
SHA-256: f28ba2f02397a0898d20083c511811cd626809f683b95f0e1a7632fefe331b45
font_02_sfnt_off00012890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1