Malicious PDF — malware analysis report

Static analysis result for SHA-256 e431905dfb75ccae…

MALICIOUS

PDF

70.7 KB Created: 2021-09-24 18:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5603be15d5b2c0329ca8823e824c36e3 SHA-1: 265f724888580a90b00aed84e25c5615428e6063 SHA-256: e431905dfb75ccaeab12d2fc151ecfeac9463dbbfffb651d3428d46cb0faf9b0
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple domains, some of which are hosted on compromised CMS platforms or disposable hosting. The embedded URLs and the nature of the link farm suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=ellipse+arc+length+calculator PDF link annotation
    • http://bjyhyy.cn/filespath/files/20210923084827.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b3afb8d4c---sulimu.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/vizetoleramorajujuzox.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/22778482053.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/tabafew.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/q6562avr5fs7a313nj7tufv520/puwatevizanitalek.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/59391013213.pdfIn PDF document text
    • http://att-na.com/upload/folezuxapetogadogusatusag.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/39110974581.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/99716887474.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/luwapularavekawet.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/boxumax.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/xugedexedikabewoti.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/wijujivivabevavixitalur.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/95652911824.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/fajuwesujib.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144478fb859b---diwoxidedis.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/walamadugasobavenexok.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/75645982683.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210906/files/20210906180230.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/definirupawakil.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/notufutisazuwuvade.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/papofon.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/zizazofitadajatebimeni.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_off0000b31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31C 15564 bytes
SHA-256: e510d73f881e4329bf6628ab05e7196f5698b5737827ba15ed1b8aa120f50319
font_01_sfnt_off0000daf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF1 10736 bytes
SHA-256: 73d1087c06997586c906f204b404233e54595c8b022506025189cefc709d6113
font_02_sfnt_off0000f393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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