Malicious PDF — malware analysis report

Static analysis result for SHA-256 84bf52b3289ece88…

MALICIOUS

PDF

94.6 KB Created: 2021-08-13 06:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 83a5a265fc12d8a61aa662242759c770 SHA-1: ecc2ea11d37ed56da0c207fceaaff596e864f5c5 SHA-256: 84bf52b3289ece883027aab6943fdbf3d51dca65a589a5282dc320ee139abc5f
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and heuristics related to link farms on compromised or disposable hosting suggest it's designed to redirect users to malicious sites or download further payloads. The 'SE_ENABLE_LURE' heuristic confirms the document attempts to trick the user into enabling macros or editing, a common technique for initial execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://nbpcpentecostalchurch.com/clients/65183/File/tabemafeji.pdf In PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/f2muhke8qnn167go575dad0514/73302771876.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/26301050178.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/sipufovib.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/daxikefetifaxamafiloma.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/walonedovazodepitowegovu.pdfIn PDF document text
    • http://headrepublic.pl/images/files/jilusafemoxalalir.pdfIn PDF document text
    • https://avenue102.com/uploads/file/8361967781.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/99dbd9190524432f749e2aa048557971/gititalatimujepuvedas.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c28db138f---voguwubabatirav.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/55847123661.pdfIn PDF document text
    • http://hzdshg.com/images/upload/File/97643571472.pdfIn PDF document text
    • https://airbays.com/userfiles/file/tidofepafolinemez.pdfIn PDF document text
    • http://haki.vn/uploads/files/97375831283.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/b7f5d668608d1ddce6ac5d042e813158/xojofoperejifutaduz.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/58a1c005d8649a52678a3b4e5d253f0d/29841251337.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/rurekagasajosotojejowuwu.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/vojase.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160af4e30bb541---popima.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/vupasinikavefegoperuka.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32522103230.pdfIn PDF document text
    • https://oliogalanis.com/file/rusofuxifapikepefigurok.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/zeritag.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160859eb23449e---2485224009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ms+excel+vba+change+active+sheetPDF 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_off00010f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F10 16972 bytes
SHA-256: 419645ac4997067acf7302a04ebeca476b689f575ee1c3d6dc6cb3e5b8f54422
font_01_sfnt_off00013b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001535f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1535F 10592 bytes
SHA-256: fb905666ec6872483a583e678f92473ee9235502204a263d85c3b94b94044dc0

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