Malicious PDF — malware analysis report

Static analysis result for SHA-256 7abbb14110ad91cf…

MALICIOUS

PDF

80.8 KB Created: 2021-09-15 19:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b18fe2be58eeb83738e919afcfb1e9d6 SHA-1: 92fa89f26ba2e653be6bfce00c4574783616773f SHA-256: 7abbb14110ad91cf3086de732ea621b2d1f5d08aa9c44c4e6e11f6c5a70b447c
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, several of which point to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable binary data, but the heuristics and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://residenzaeden-albisola.com/userfiles/files/murolelekekevuzezu.pdf In PDF document text
    • http://enricobarraco.com/files/96088168203.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/40701090549.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/91192184241.pdfIn PDF document text
    • http://myslizdrave.com/soubory/59847141102.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/wivoxuwozinesonowi.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/rafagipenowafa.pdfIn PDF document text
    • http://355353.ru/userfiles/file/vusijamedigotepoputob.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/67477157399.pdfIn PDF document text
    • http://zxsolar.com/d/files/vanovemitisaf.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/pijobimufoguzovuzefuxegu.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20219981126549.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/e3qhbe36sk7tmornptbk2804v2/41795323644.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/18967659990.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f416ab851e---nibisi.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/50140702018.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131556236709---17790324391.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/xunokivugosowesodezube.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/veziworagekuborebek.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/waxapikavuxeruwitapejo.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/42587725054.pdfIn PDF document text
    • http://vanhacollection.com/images/files/girizuvofejezuteletuzani.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/31827151824.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9332eb8eea1375c3e46b9356cac0895c/bosafum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=flowers+wallpaper+for+androidPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210915/16317137645708.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_off0000d58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58E 10456 bytes
SHA-256: 0de4ee3c467dcb5585f2019fe833b78a3ec9b160802fc43d48e06dacb1cdbd16
font_01_sfnt_off0000ed70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10582 18280 bytes
SHA-256: 260aa05adae22ff1a134fc90be875e48446dfc6fb29d23eda31b08c1928011b4