Malicious PDF — malware analysis report

Static analysis result for SHA-256 fee159a9e5a1b6aa…

MALICIOUS

PDF

75.2 KB Created: 2021-09-24 05:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c22c16955415a712c27095596dd0b8be SHA-1: 63ddb2fd307c158da08700262e24a4fd616a4b34 SHA-256: fee159a9e5a1b6aa02fc6efa04594ab822939bee57dc6a3a7e18c61eedb8f8ba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting. This suggests the document is designed to lure users into clicking these links, potentially leading to phishing or malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.
  • 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 https://pistant.ru/uplcv?utm_term=windows+file+share+android PDF link annotation
    • https://global-product.org/CKEdit/upload/files/23219934386.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c150b490ee---datiwufawolokerepixe.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/vazerafup.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/82626904587.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/xofibewenazodutil.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/liguvapirofamewix.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/5743918896.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/kidejonijitode.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/milewutogetexususunuzoni.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161337872ae7fa---nizomezubuxibifuzapesiler.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/27299853457.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/fusafakavaluribow.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/towuxodujixel.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/muwudegeduwafo.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136afc7bb310---pidavajapamorisiwibixixug.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/rakazogowebelexutovonaxol.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/3600687239.pdfIn PDF document text
    • http://torgoborud.org/images/file/wubetekagi.pdfIn PDF document text
    • https://fototipia.hu/files/files/56364618323.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/01eb128f9637bc247e31cfd344558289/duximafusavoresuk.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/zekogitu.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210922_CB577FF9F41A2190.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/fadol.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ae3a1f729---41814998973.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/nofavudoxuzelirosapebe.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/99634256661.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_off0000c58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58E 16280 bytes
SHA-256: d62c84d616fa5dc2fb7154195e4013f59243c16bc2ed1835d108fc6d57a8e08c
font_01_sfnt_off0000efca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCA 10432 bytes
SHA-256: 2717a253a289fe63fa29e0fe920ae853994d9772a1496e3ccb68007ea6983df8
font_02_sfnt_off00010767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10767 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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