Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d3f708b2ae0245…

MALICIOUS

PDF

83.0 KB Created: 2021-07-05 09:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0873a1a06c32c961307b8999cb5303f8 SHA-1: 08a6c5367f50eec6bae94a3b4b2bd62200439e9a SHA-256: e8d3f708b2ae02455cb0e004afd8a6b306b5a8dd16f09c1cead91ce0204a3f36
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the heuristics and URLs strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/l7t5o271hbb1do54opfrblkl3q/mixorabinozizeja.pdf In PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/f7334c624d9fdbe139de48ac89133912/43201113041.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca3c607dbb---13587948811.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d204e6516b2---xuzuvuserirulepawoni.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/544411528cec1fbc3d3681bc37cc8db1/muwalizesanopogofasikiw.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2e29425cb---7055930843.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b04f9a3d9db---91382222874.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d180cda9f1---neratipes.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/85065357234.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/rogugirumuwapojuda.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/joligi.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/miwufedofexud.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608753ced2e63---putevibi.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/ruwidapunezilofatu.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/xemulub.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/a4452141daa304f0580b15a2f8382403/witar.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/togipivumuxujevijane.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/kadixexivazumebuvajera.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/lelukotugupirudelagenis.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3138e93279---38542213027.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/lopuxib.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098b75a659a3---42041255521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=concept+of+random+variable+in+probabilityPDF 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_off0000ddb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB5 10964 bytes
SHA-256: 48c92cb5eefd16de4bb05c187001ed58f2be5a12ad1dd23e2876f7222def8915
font_01_sfnt_off0000f6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F02 18016 bytes
SHA-256: 53ea25d8f3ec687df16693833b60cac9a5d9d57dffd2d888a1c62bf0cf42ba27

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