Malicious PDF — malware analysis report

Static analysis result for SHA-256 780d1c1096a2e29d…

MALICIOUS

PDF

84.4 KB Created: 2021-09-04 22:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6b76f08b59b55e38374d5055c683652d SHA-1: 8b765f2ecf4c33a54674268e7d92abd65fee5941 SHA-256: 780d1c1096a2e29dd576d8edc51331dde1ff9d23b7ed81dab13cc29e0fc57e6b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of multiple PDF link farm heuristics and embedded URLs strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://dobermanncz.eu/files/dozefukefuzekekowemut.pdf In PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70ec5c1c35---fizukatunovadesiw.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb12c1acc07---75504360243.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/61479707932.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609053ec5bf81---21592025295.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/56019314451.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/95400706727.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb89211469---99995353204.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/18813086108.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/96725713045.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/teveniwilumevunigexodojox.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/fazeva.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/momeviti.pdfIn PDF document text
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/lulewonaf.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/pii4htlme5qf2e6msrphl9lr5f/sibowofifezizezud.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///vinisufizeridize.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/5chffmabla87bgtn4ls6v3ffbn/xulux.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/2301fcc9040f9e1df294d8fec8ae5408/21560398142.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/ad534c3eb80a8ed61a8858508c1cb2b7/62486680201.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8fae42656---jowekurevenirudegonavex.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612a00ea5b956---wemurisifajumubegabag.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/wanivogidigerumoganub.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b22d30938---6283777411.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/70749903803.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/1rt9jntpdksg65h4f41akgdhlp/16999439997.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/25690190524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=lothaire+kresley+cole+pdf+espa%C3%B1olPDF 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_off0000dfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE9 18724 bytes
SHA-256: 5372f920781f64a74957df80e734810788f4125a86fdc1ba5e52ac1ebbbf9b68
font_01_sfnt_off00010ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12815 10980 bytes
SHA-256: 48e0559dec50e264cf812b9afba5ac717f04d8381c20a17533d15ea1f024b7ad