Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5038fe381b84c5…

MALICIOUS

PDF

79.2 KB Created: 2021-09-05 06:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 08250193e161e815adb94bccd00c5a31 SHA-1: 5c644fb8c1be1bd50d3a24cfb1bc9570a4ec4015 SHA-256: cf5038fe381b84c5e70844c288a6289397cf159be2edf721f337ab863f48b53d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The primary function appears to be redirecting users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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 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://bodegaadrover.com/userfiles//imagenes/wowiboxo.pdf In PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/50851415864.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085d00d1f4f1---towupaxenetawofigeporovoz.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/vumuj.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/33287090318.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/gidojerilasogapigewaveg.pdfIn PDF document text
    • http://clerus.hu/files/file/zonemalilojijavalevasa.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/4169452677.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/86msvch3mcanrt3smb1vnj744v/timanudujajeloma.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ee73e38245e---64313357960.pdfIn PDF document text
    • https://tl-systems.hu/files/files/89737757210.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/62826174416.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608145dc6c366---balodogivalofozij.pdfIn PDF document text
    • https://premiersuli.hu/files/files/21711664683.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/hbu8iach3kpnkgk093pn9ko26k/jenobaw.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/11377437103.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/99183228978.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/mowali.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/016314ee6fa0d407b5e657d9499584a4/69298369930.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/fezujivebekujexobe.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e22bec9a138---2228077192.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/ng8h03tepdcoppk12e4g9jc2va/88678167890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=android+multiple+photo+to+pdfPDF 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_off0000d0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B5 18344 bytes
SHA-256: 86ee7b3e77d45263c1ce6ee89ef9028538914f00a26a8ee635bc0338b37ce413
font_01_sfnt_off0000fffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFD 10516 bytes
SHA-256: 9ca538208ddf49a3a3c4e44e27f6695d3566c0efa23c22b17628c7c75fef2f6d
font_02_sfnt_off000117aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.