Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be281b2d7461512…

MALICIOUS

PDF

84.9 KB Created: 2021-08-10 14:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 835c150dc824e4aa91b1e16b9b39fd65 SHA-1: c4937d840cec91e03b21885a46fa1734d9fdf85e SHA-256: 8be281b2d746151251fe9f1f1e954fb1c2fd6039549128c10ad243a00bbfea37
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting, forming a link farm. This suggests the document is designed to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://asiajitutop.com/contents//files/vafeduganoxixala.pdf In PDF document text
    • http://iphysiology.ru/upload/7465697560.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/nanukuz.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/gidezujatunugunazuma.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/36838291288.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/v1kov7sksv1ls92nhf3dvvaglt/peduxodusovipagubo.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b632cc67ba0---15265169033.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/kawixekegubikidik.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/kigezeseganevejojugeta.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/cb9797bb982a2e7a78fedcca95385cb6/romutaruvelijimit.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/45634564493.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/sixuxideloxagegitupez.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/9801612817.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00ae2da17---50585607305.pdfIn PDF document text
    • http://ipllaser.in/uploads/xuvizisavorosofara.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/jedemunosexasafumukomelud.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859c610d740---28053872004.pdfIn PDF document text
    • http://drlalashow.com/php/billboard/uploads/file/rufajogixugenexuvis.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/78970224074.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/79020484786.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afe4693f4f2---30285197802.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4172bbc2f---87949721799.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/vonosasutajeledulameb.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c983fab724b---94493393242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ejercicios+de+calculo+de+formulas+empiricas+y+moleculares+resueltosPDF 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_off0000e210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE210 18128 bytes
SHA-256: b1488b05611032380d3f5c23435a967c02543976e6ad8ec6fed6615aea51c32c
font_01_sfnt_off00011026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11026 11004 bytes
SHA-256: 1fc6be4890b7b15da03af402c0ce07f07ffe4aeeada3093a1d0778ca368590f8
font_02_sfnt_off000129c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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