Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce6decd7ffd940f…

MALICIOUS

PDF

74.8 KB Created: 2021-09-12 20:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f1303e04683d3eec1a3c81e423bacc1f SHA-1: 8b166ffbe36524860e566035804b83bf0ea337d7 SHA-256: cce6decd7ffd940f1f09e9e73383f0f230c1506806185a4be45532c3ffb85c61
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cructi.ru/uplcv?utm_term=the+neighborhood+torrent PDF link annotation
    • https://gkatsov.com/userfiles/file/43094526227.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/38350121773.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/47281958886.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/487770577.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/diwivusit.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/bigobufidojixamanizu.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/59577200927.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/tixozimepanezobumug.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/polavipog.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/57a6996983b625167c67037e2da10a1a/94077569204.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/golaja.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/jivelogajopidatufatele.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/jifowekixiliza.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/guninilulaxiduna.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d16655348---78104216572.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/62972596360.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/31130479533.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/10163577417.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/sudapozonek.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613157e2cb9a5---41980677783.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/rexatugalametalu.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/zudilokozavekojufogiruge.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/bifuxidu.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_off0000bdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCC 18284 bytes
SHA-256: 4f529502084873f7e7355153b3fbf8bba4978524858e50f269acab3d5fc05c7d
font_01_sfnt_off0000ed97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AE 10252 bytes
SHA-256: 529f03a07df5f5166dedb9d5ea531fe6f255c77870512abc51edf50eb7cbd54b