Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0826d9f13d0d458…

MALICIOUS

PDF

67.5 KB Created: 2021-09-28 16:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c9499f8b6acf74abea9a907b9890ea55 SHA-1: 3a2b8555356736c0a5426fe39449314b364bd2b2 SHA-256: e0826d9f13d0d458a0b15b7271fddcb6c5a4fb7fd200d7911f4e8fb596dfd35d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of multiple external links and the overall structure point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://nexusmediation.nl/files/89432214178.pdf In PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/29666195470.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/0b6f9d0ec394a613f5e1c4f6be7c6790/titajokulaxokolimigu.pdfIn PDF document text
    • http://tchid.net/userfiles/file/92688160600.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/82lng6c54p4vktuv8u7paji374/gisij.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/bodevoluverekat.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/pazozusajuxomifuna.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/276f47d98a12facc861e4fa7cd2e04f7/83318556101.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/54935877621.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/rinibun.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/55966191111.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/repuxejelim.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/kupiveg.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/49499179786.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210926024407.pdfIn PDF document text
    • https://tcremich.lu/files/files/71852645570.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/43659428246.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136a8f02be39---livewotuwaxuwitifigivetuv.pdfIn PDF document text
    • http://www.bash.cl/media/file/xozavivelisezawijen.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/67108814107.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/siwebumogigagejovel.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/zujutenutasodapudajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=lg+android+net+phonePDF 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_off0000acbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CD 14808 bytes
SHA-256: 77c9893bff039e6fadbf4c8f34fa2dcecdc5971c52d7025c46f06f97b8e54d7d
font_02_sfnt_off0000e990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE990 10416 bytes
SHA-256: 8acfad94ce7ff6cefddde2635ce687e0a24bb3ccb823ea2c4a8c3c4d8217958a