Malicious PDF — malware analysis report

Static analysis result for SHA-256 368bd86ea3714bfd…

MALICIOUS

PDF

87.9 KB Created: 2021-09-07 08:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a16733a33d38c6c93597c9c1672ffebc SHA-1: 83a2cf6daaf1ae661407153439900240069508f1 SHA-256: 368bd86ea3714bfd4a235670034eeab7e3a65b5e35456f671d8cead8b8971489
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress upload storage locations and disposable hosting sites, likely intended to host further malicious content. The presence of a "download button" heuristic suggests a lure to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lemanssrl.it/file/kukixiluma.pdf In PDF document text
    • http://supermarketdv.ru/files/file/bamiwisexe.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/zetukozofap.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876ed67329a---38430200504.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/95570253095.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/gewanelipipekowifixuxale.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f303d50c3---34122254418.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1629241320a892c8143cd6cb6222.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0d646cfc6---72468675321.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac95dbf41c0---55569414483.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/79167080916.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/lomibexazefinedovawepa.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/05e865cf48fbfb075f4156176b05c700/44537013858.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/zekogakaxedazebibeke.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/88865408806.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/uv1p0cnnh3gfti79j3uot117kq/nepul.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d02b5f64a---85488997616.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/74b7b46c6af3fdb83cd5791cda38265a/xokodulevoxufimitit.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/wufiruwipikalawepujogi.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/vejorut.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940566c6bad---sifuvanofabubovatagom.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/sogixavuxetodupanul.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/sasomanajujugusaledo.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/70869972961.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/wezipibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=windows+10+opens+pdf+in+browserPDF 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_off0000f57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57F 16948 bytes
SHA-256: ded4fdaa754fbf67247ca30e1b54b3c2ac394457cf1968c57c44095dfa031dac
font_01_sfnt_off0001219e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B5 10580 bytes
SHA-256: 10cdb77c3df185c2a038333110df7a73d84884d586848bcc510f4d65a81a4543