Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36857e1a3d26fff…

MALICIOUS

PDF

74.6 KB Created: 2021-09-06 01:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b796e88549e7f2947de01de1263324ae SHA-1: 5a32c0112ce49d99acc5043b4c6954799e77e260 SHA-256: d36857e1a3d26fff4d414ab6054d63154c4d0ad914e7bb5ae0d2675333798f18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

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://chcial.ru/uplcv?utm_term=recurring+decimals+into+fractions+worksheet+with+answers PDF link annotation
    • https://melz-feu.ru/upload/59651335989.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/lelawovesegudupozizakoxo.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a47ee746dea---buvugelitaxozudokatupapi.pdfIn PDF document text
    • https://webhosting4.net/media/file/63224024009.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/4abe6cdb10518b28209e119d3c5fe2a7/96498522090.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/tiwatepiwewegujemilelod.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16096ffc29edb6---37041400944.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/47918576379.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/foxirijojapimalosubeker.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/fisusevazirilekurotadubux.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/87253556171.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/94424377791.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b35439a065---jabaginalezofi.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/67370873536.pdfIn PDF document text
    • http://mylodge-naoshima.com/vukedixa.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/juzuloxogupuwogeverilet.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/hb2p1bbtr1nb66n9u5mum725t2/nikunujijifuwu.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/tatakolubodevizim.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fd8fe11da87---55200238051.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/21007082712.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/2e389e2f028d328b75d1b0add6c11829/subew.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/33929030170.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/lesiz.pdfIn PDF document text
    • https://unosms.us/userfiles/file/xeloseludasezeke.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/58712129601.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_off0000bf51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF51 11244 bytes
SHA-256: eb081d6e0479c4bafeaf847f2666458f1689d8b1314dbaf8ab2119b81b88b7eb
font_01_sfnt_off0000d95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95B 16716 bytes
SHA-256: db835340891f8c9ed60c1a3d484ebe0b54dae18aa7a7e2fcbffeaf9bdb602d83
font_02_sfnt_off000103dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.