Malicious PDF — malware analysis report

Static analysis result for SHA-256 618b5cc7e7d435d7…

MALICIOUS

PDF

78.6 KB Created: 2021-09-20 22:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7534c4858dfdb3534ee55da110eef3d3 SHA-1: d40422fa6eab21dbb9783e88829e0daee3f03771 SHA-256: 618b5cc7e7d435d7fd0f85dab09135629148554e6fa039a461f3ae65e44f9131
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and a link farm indicates an attempt to lead the user away from the current document to a potentially harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://bc-arman.kz/ckfinder/userfiles/files/96475185224.pdf In PDF document text
    • http://sobateracota.ro/mm/file/zopijapan.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/lugupapawa.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/10748778265.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/wizadisowala.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/36148320542.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/kapozexemado.pdfIn PDF document text
    • http://rc-modeller.se/images/file///xabazuzejomukeleditagafek.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/tizobagafax.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/tometetumeke.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406200c002a---26877643910.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/karolivupu.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/86765000513.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ff5e99472f7388422f11206144c19b7f/jokegegugitolozo.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/kebura.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/gerosegekelid.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/1r68745ghblsf184pga7b64cgg/xegurijeko.pdfIn PDF document text
    • http://carszana.com/image/upload/File/99756596543.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/79995861339.pdfIn PDF document text
    • http://annabarons.com/files/files/57094087329.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/2539857721.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/mumefujuxefewojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+autobiography+of+benjamin+franklin+by+benjamin+franklin+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_off0000cda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B2 17392 bytes
SHA-256: 7f9aeae248f13571e4cde3f08641c8bd8ec468486efcc9c9c67ad277d91cf666
font_02_sfnt_off00011265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11265 11316 bytes
SHA-256: 3eb8bad12525e2e507e68d11a8e92a1e35426cbec13190a66965a3f7b37967f3