Malicious PDF — malware analysis report

Static analysis result for SHA-256 122e5685a271ee0e…

MALICIOUS

PDF

71.1 KB Created: 2021-09-21 00:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6f2837cb614e3e65f1152eb8e24cd0d2 SHA-1: fb9814714e71b5c46454b134f2bfea16533b5eac SHA-256: 122e5685a271ee0e51b741fa7de19bc1bbc398ad72b272d55013489e125183d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or leverage trusted domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=free+share+apk PDF link annotation
    • https://www.algeos.com/js/ckfinder/userfiles/files/34344723833.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/25191808438.pdfIn PDF document text
    • https://kiptep.ru/file/19344568490.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/dopupuzegitidilafomor.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/tenalotuk.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/sejiwufog.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/55654241352.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/pizelatusezupudi.pdfIn PDF document text
    • https://premiersuli.hu/files/files/47626185810.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/75201952192.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161300962e05fa---gadebix.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147177e81dd1---tixifejatifimisivi.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/93019938666.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/jelekudedu.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/60066905656.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/makug.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/40239857223.pdfIn PDF document text
    • https://ksuskalology.com/images/file/79146669240.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/wexewani.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148caa670e27---pelewatabosewa.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_off0000ba16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA16 15544 bytes
SHA-256: e8cfe669a842eeaa3f8e90952f1f1bcc7e7300a25e39ebe7507287531ed3004f
font_01_sfnt_off0000e19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19E 9960 bytes
SHA-256: 13bd67e7777740bf4e90570097b4405176f103ad4c27957d47ce6db65c6892ec
font_02_sfnt_off0000f7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1