Malicious PDF — malware analysis report

Static analysis result for SHA-256 461e10e5ea72f855…

MALICIOUS

PDF

87.0 KB Created: 2021-09-06 10:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 08874ad9b2b96f851382e5fa6092db9f SHA-1: 9b747dc267adc57fb3ffb31f7234fbd129956412 SHA-256: 461e10e5ea72f85577e4850651429e9fcae0da75077e7fcc900849432a849723
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

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.
  • 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://airshow-bg.com/file/mupegemegajibobivivel.pdf In PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/razogutinefiv.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/rufeka.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/vugeba.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/6gqgt8e50qocbv42vn90lm9f02/danavudivawekaxewamoxomu.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/a42ed1396fd52fd795ff82ee5b12d046/domafomabexiwunuket.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/42437368397.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/vudogurojop.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/20253900493.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/mimodewiruwofekonozikon.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210728131039_79w5n7.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/21662033693.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc541c6ca0---zuvajujiborok.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/49075602096.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/zonoluputezaj.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d487a0a508e---17581828104.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/88133607860.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/1n65m63oohvoq6m2suhsj36qn4/80390379452.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/4407376124.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/zemixuforo.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/pukofikitopamupiriduwo.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/23662064169.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/fonorefutaraxalolim.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/8153398620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=academic+writing+exercises+pdfPDF 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_off0000ed2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2D 18300 bytes
SHA-256: fce40501e9a46ea525589a39e0dafba40c7d10c8e98d5e28df362e4f78004312
font_01_sfnt_off00011cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D8 10968 bytes
SHA-256: 54e1811ee1a52b2af7cb96496835efa11a9bcbec8f36be698c399d20e1585652

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