Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a0ecdd8b08baf7…

MALICIOUS

PDF

73.8 KB Created: 2021-09-28 09:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c39ad715b776428e9d89fc4601f4fec SHA-1: 3c7b0a3cbdd6159d0802266c2e56e266d58c6c9c SHA-256: c5a0ecdd8b08baf7bc66ee68a1a95a47ea0d9322f6b700a495e4e3f4600d630a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms points towards a social engineering tactic to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://catherine-massage.com/ckfinder/userfiles/files/10797688641.pdf In PDF document text
    • http://tuzvedo.hu/elemek/file/80473155894.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/malibabafimonagokojifi.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/39882096039.pdfIn PDF document text
    • http://sieuthibds.net/images/files/48230705584.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/29613073410.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/lobosojaza.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/dudikurad.pdfIn PDF document text
    • http://wwsm-us.com/files/file/6692632547.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16152a9d55a1e4---36573533349.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/dijikulakoxanofagovelile.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/sewodu.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/52726980175.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109092307017154.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/zitagemunivosematida.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/73416205416.pdfIn PDF document text
    • http://sivam.pl/files/file/zamuvubazububu.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/6131791241.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/39a3583c82711e71c94d61e25b885cd7/79506376205.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/ligevepokovajasi.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/58349677683.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376689a16e4---tototaviwomab.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/82326913439.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/32408057632.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/levejarujalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ip+webcam+obs+audioPDF 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_off0000b82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB82E 18864 bytes
SHA-256: 6f4d96ae59d0ffd7bade76c5ca3cbab0b9bae54923deeea2a3dbe8d122ad287d
font_01_sfnt_off0000e991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE991 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A8 10604 bytes
SHA-256: 52e67d83dea79d1f8de7ffa2832b2e564979bcb781f6dcc22826805fd4f1e6ef