Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f50799284a26120…

MALICIOUS

PDF

105.7 KB Created: 2021-07-30 20:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 804a36cdc9621d83575d9ffd92966c11 SHA-1: 5d3e218802515d28fd78420d9c99f83336a8feb9 SHA-256: 6f50799284a26120fa4b0052dc90f87a6236b3d45fd6bff56d00738c39d8324e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL findings suggest it's used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://abwingsva.com/uploads/files/fuxiwesef.pdf In PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/vusiwinimelitefibiwelibut.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609903cba175d---dopebevu.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/pazazovagatogod.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/sulovulefuluwawivu.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/26971595866.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/rebusodibixilodano.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/wudewefexe.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/2b2bf1627efe9fbde820af367ffe3588/susepusazasifipegamal.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/b90a6fkn7mil65pe6d650l2q6j/38597815493.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/25182324531.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/22657952607.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93923c835e---norukafiverodinekogutupe.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/valipilegimelejugal.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/92uiq3donipj7spg0fbb53sed7/kadeboluzexeliluk.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/eqmm19857b2ohso68s6qtqcp26/89689993107.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/3f6fe0f6a7ef8bd22d5b60357dde7c76/gosimudimuzasogaginirik.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/vunuruvilejowojazifov.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/nutetijes.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/6326842677.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/veluwexam.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/kabikorokoveta.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/visabilax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=navodaya+vidyalaya+admission+form+class+6+2020PDF 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_off0001358e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358E 10972 bytes
SHA-256: 06f2db5ed2bc16e4f61ac30ea247cb1323d476e1fb71735f3c128c7461769680
font_01_sfnt_off00014f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F06 18732 bytes
SHA-256: 3f44b5665381ceb5afeb7e805bccc3709847fe4f1b02f720adb97e2fa3361f62
font_02_sfnt_off0001800d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1800D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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