Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac8ab71100f8535…

MALICIOUS

PDF

70.1 KB Created: 2021-09-28 22:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: dd5f852176ba4b2f5ae532b6a5106bce SHA-1: 0875213ae18ec0a088d0653a50220fc62a4484b2 SHA-256: 9ac8ab71100f8535615d4051b02d0dbb4df44acd962ba20090435fdd4396299d
196 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://inwebjor.ru/uplcv?utm_term=saadi+love+story+full+movie+download+filmywap PDF link annotation
    • https://barcelonacentromedico.es/files/galeria/files/lipidujilijek.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/88076536217.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/tezemepesolimof.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/bj9ib1dq0a8lhookodd1mriqg7/ximoredariw.pdfIn PDF document text
    • https://tierlistei.ch/downloads/mopejiwuwezikimaku.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/mokexirub.pdfIn PDF document text
    • http://bamila.vn/luutru/files/11237682321.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/vkqs6de9r398n12ijvjjs1kq3p/kafemafiweb.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/98986583237.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/jupifiditiberixurixazamog.pdfIn PDF document text
    • http://erdbau-rauch.at/zawurimavenusabizolabo.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/sudukukixodunaxorebat.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/14569510490.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/golalosiso.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/24/tebibojaxezuv.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/20398741142.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/sakimanamulu.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/varonopugavulifusizem.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/vabirulinipituroxuni.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c22c4524b7---26401517524.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_off0000af49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75B 16200 bytes
SHA-256: 7781180163ced220133667067e3ea6f90b91c32791483d0026dd62cf1e530d35
font_02_sfnt_off0000f0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DC 11100 bytes
SHA-256: d4445e146746e2f534c76002922956362ac481d19c8387dc149ed1c15a2c23b8

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