Malicious PDF — malware analysis report

Static analysis result for SHA-256 2358c7166c5675b0…

MALICIOUS

PDF

84.0 KB Created: 2021-09-10 21:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 46b1f817d0c7e28ed71a198773bc087c SHA-1: 0db708dd006fd32fca95c5cfaa2e8e222d42b1ff SHA-256: 2358c7166c5675b0995cab9ce0e9f7d691c1dc6e3a4dbdca85956fbf46341952
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.puskinas.lt/ckfinder/userfiles/files/kowise.pdf In PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/8330168344.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/dosidaderajivusogex.pdfIn PDF document text
    • http://ipllaser.in/uploads/roruvurasijumuliropefi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d01556c62---wemixebosuxawomidip.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/zodasikebomosixu.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/tarenixefipi.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/zironojurenoxeluxa.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/1476460841.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161372be19d18c---90403767360.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161318ffbb4865---telokuvovegefidudeze.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/17241470742.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/faroxafik.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/dipijotagusofejigizu.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/tovurupododojiwajused.pdfIn PDF document text
    • https://porfic.com/fotos/file/46237796495.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/21337242141.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/70570043116.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/21215516779.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fe94310a5---vusob.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/81413494283.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/9515181381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=best+android+widgets+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_off0000e3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BE 10760 bytes
SHA-256: e478b93f083856de2f4627b65eb7c02df1ad6a60344087c0b981ffb3a0065dfb
font_01_sfnt_off0000fc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC91 17716 bytes
SHA-256: 5133199cb4aee4b757f9f828a372429af4f020307f9944ed627b97a4a0e24712
font_02_sfnt_off00012a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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