Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52f930df2f45633…

MALICIOUS

PDF

84.3 KB Created: 2021-09-17 03:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8ee23da622e50643619f5967b7e50584 SHA-1: fbe36dd36edf832fd2cb93c2015e8b2f1eb2e10a SHA-256: f52f930df2f456331fde8119852fde890684a0a2ed72834ebc636179a792cdf3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

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 https://coretry.ru/uplcv?utm_term=multiple+bluetooth+connections+android+app PDF link annotation
    • https://almudenafernandez.co/ckfinder/userfiles/Files/77142254231.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/lonubenupisobe.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/momumemawisopoguxadik.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/75713972602.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b9a6cbcf9---68437707248.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/94174887039.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/xisezelut.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/64050949643.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109011320468068.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/papemutove.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/17445516964.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/81626083270.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/99296255661.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/49090335798.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143d95549d1a---sadujotarabupoki.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/74237926604.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/46978118547.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/1b67b79a7ccee58327b9ee525e0cf6d0/xokoludunilimaruzojuxama.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/9921974973.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/33861875156.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/fadodenilujavakavule.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/16032597225.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/82hqan3df25guqrd8psl303cc6/dakiwipefiximedefasiwo.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bdd62dc73---rigomivid.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/fetutisanozoru.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/33148979758.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_off0000e5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AF 10844 bytes
SHA-256: cf128821a52847dce411f52c331dd945de45a5a42af0756a3e36ec376ba194cd
font_01_sfnt_off0000fe66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE66 17164 bytes
SHA-256: 4e625d66b09464277aecf6c1216aa88b85d8833addc1e1173e5bfe6513fd1ac4
font_02_sfnt_off00012af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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