Malicious PDF — malware analysis report

Static analysis result for SHA-256 56604cff9c46f6a4…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 21:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 637cafcc6dc3f36e49af46846907fa54 SHA-1: c80f47e14a0dc57cd175b87f1fcd30b93cd3dce7 SHA-256: 56604cff9c46f6a426fd72a1cdbe6508372a7ed9d33b097f276370b89c3c5fb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://smidgel.ru/uplcv?utm_term=socialization+skills+worksheets PDF link annotation
    • http://eska-lift.ru/userfiles/file/dibejagujibumexow.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/77471533450.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f6c0421c0cd550d8a9c4f0e14ce28be0/miretevofe.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/jutelufopulafasatetamifo.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/wafesasuguxezutaki.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/73671365975.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079972730c32---savitukomexe.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/76444835083.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/63142385063.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/palalusifesekodamilerufuw.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210605055331.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/94524103960.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68b487849b---jelegegurabusumexofaduxa.pdfIn PDF document text
    • http://faradbox.pl/files/file/17114275931.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/ragogo.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/32781643862.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/ninavabasirafumuwafojo.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/40749683916.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/wiratarat.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/42794811221.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/bodizatoraturudaroxe.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/zitudot.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/bonuku.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/91744362495.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/ql2t7higaq33ndhkc4mva0ohc3/goroto.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/xefawapubofevivugalo.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/faxefipigonedegalixuzal.pdfIn PDF document text
    • http://standdominica.org/files/files/39407162886.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_off0000dcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF9 16456 bytes
SHA-256: 4f9e64c9d72a3ac2ef36bf028f404a9009dec87af03a4b6a51125d9a9a2badae
font_01_sfnt_off00010794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10794 10640 bytes
SHA-256: 75b45f146ca4dc44cef6f1a65f8f51a1c9dbee08c173802d54eb04d1565865fc
font_02_sfnt_off00011ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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