Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c544834e86969e…

MALICIOUS

PDF

80.4 KB Created: 2021-09-21 08:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dc37ffac2bc69995936a2265028e5980 SHA-1: f3340d524615f65313bf8b6ad0f67d81cfdeebf5 SHA-256: 91c544834e86969e8cbcf8b6943e3dec4ba42e43f4bb54096dc31e9ff2c2260a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports this, indicating a lure to trick users into downloading a payload. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.
  • 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 https://infrive.ru/uplcv?utm_term=game+killer+apk+download+for+android PDF link annotation
    • http://barexkft.hu/userfiles/file/tavinilovemibogevil.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613421ea05760---japoduvinado.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/30981040509.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/dotejal.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/tulujotad.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/41416590664.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/ximemilopalapaluxozaxumaf.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/26379745462.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///47698828635.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/ferifase.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/92621459180.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210915_1A28AC17BE90655B.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147af1ac202d---12507300126.pdfIn PDF document text
    • http://ortosprendimai.lt/userfiles/file/20406426237.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/82583823702.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/sitifew.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/3069482920.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/38264065205.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16148e05239cfc---ditedovax.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142c45c207e4---fokorimusalilunovenabima.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/83493902482.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090406275692.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161459f2b26589---80457037184.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_off0000d6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DC 17812 bytes
SHA-256: 074c595676ed9025dd176b1965980b6dfd85aa5c90a890c7948da41c9c082366
font_01_sfnt_off000104bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD3 10612 bytes
SHA-256: ea92783f6787fd4878614462bfdf4b7febde7a3f7a7a0ec5d39b5a9bdcc440ab

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