Malicious PDF — malware analysis report

Static analysis result for SHA-256 c865c632a19e76e2…

MALICIOUS

PDF

82.1 KB Created: 2021-09-16 11:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cfc561ca3215448097ae0b985534081e SHA-1: 6f8f177405abc6f3e3f140209717a09bf81b86cf SHA-256: c865c632a19e76e2c0e96376152f666b15c86f72470b13539aef7aad31d5d4cc
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple disposable hosting domains, likely intended to trick users into downloading further malware. The presence of a 'download button' heuristic further supports this phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://studio70.eu/userfiles/files/66139466480.pdf In PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354f797ef02---60466665205.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c1f483793---fadumifimamifidajolixigef.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/mozibekumawufosuzamofifa.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/vujedizaxikelatew.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/bexoridolapefasenoge.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/37827603512.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c13e9306e---fizivuvutatukubag.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/26018930306.pdfIn PDF document text
    • http://epplast.com/files/file/girisirudevo.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/49085208218.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/11661725867.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/gokarafow.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/7437725815.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/f45e7ab76ca278e52bad6ac4c998c849/konepidukubunenege.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/9247479429.pdfIn PDF document text
    • https://31app.com/userfiles/file/39828803700.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/webuw.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/97422767236.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/72197657525.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/nowitovotajenelenawozex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=kof+97+download+for+androidPDF 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_off0000d25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25E 22112 bytes
SHA-256: 35ea51f3dfc8880cc7ecd81cdf9730518d0c28b0da0a6852e268973bea0aedb6
font_01_sfnt_off00010bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D5 10244 bytes
SHA-256: ec0d49b53cfaa0771acc80fec4a6888e072a83da4c9c0345d8852154c3cc7d83