Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c2c1cf52bf142a…

MALICIOUS

PDF

73.2 KB Created: 2021-09-26 15:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 764c7902ca847ff9061d3c2b81ff1a40 SHA-1: 0d3d59a6f039295f54f46e9d39987ed70fb82d3a SHA-256: d0c2c1cf52bf142a1be5ad83e0332189db0090dc5386d0581aadc31252686e33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of an attempt to lure users to malicious sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://synerhu.ru/uplcv?utm_term=smart+tv+vlc+player+download PDF link annotation
    • https://doublehaircenter.com/upload/ckfinder/files/mizevavu.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/pesigezeb.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/60426249869.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/24248476672.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/42636755e5441f4f292515fd7dcce93c/90081931679.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/difitamasuxenopi.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109190356144262.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/624b2e2bb5a30d4b5fc0c90f14a21025/31342073199.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/nunekagul.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/589e82bb14ea72571ef58dedddb82c5d/99886095309.pdfIn PDF document text
    • https://polandpools.com/contents/files/fibofadik.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/mezapaka.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/46673430231.pdfIn PDF document text
    • http://greenglobepms.com/uploads/somomezu.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/56896710378.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/veralaxo.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/10580057906.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/desifiv.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/99573556962.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///jujamikerisesanun.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/bf0aa7897409f01679375b1215418f6a/boragiperadulawajanofus.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/dibudumojixutakew.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_off0000b54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD65 10756 bytes
SHA-256: fd00b9208b71be8d1d0a0672c141cd45924e36a8224d95015c170d483c70c109
font_02_sfnt_off0000e631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE631 19012 bytes
SHA-256: 1c3c2bcdf9b530cccc3bc7fae76ca434209824d38c13c4ae54554a61d899aef7