Malicious PDF — malware analysis report

Static analysis result for SHA-256 828889a5dd36e1ec…

MALICIOUS

PDF

82.2 KB Created: 2021-09-01 13:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ec5543e00ccefe73c3a0ea119bfd9114 SHA-1: 711f1308c15369c63094d12c91da9be2d97fdb0f SHA-256: 828889a5dd36e1ec9aef57135a6945799f6c02d1975c2021c68fd54a5f25490c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to websites that appear to be compromised CMS upload storage, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure itself is designed to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d38a2358bf---gusij.pdf In PDF document text
    • https://bamfieldrental.com/userfiles/file/werani.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607641a1b3c63---jevuduzatulowip.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210630034613_hn399i.pdfIn PDF document text
    • https://italvaping.com/file/vetojirilewade.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf24e7c2a7---11304451058.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/38250047686.pdfIn PDF document text
    • http://anupbolivia.com/images/files/kafixiwelevexo.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/12601467036.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/baxuzuveba.pdfIn PDF document text
    • https://abeess.com/userfiles/file/65683406672.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/38704799051.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/bonudubix.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/wukubogupo.pdfIn PDF document text
    • http://come2menorca.com/images/file/39189818099.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/pejadivawulubigudanexib.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/9c22df8b6fe1e69466cb898418baa80b/ziresatexoxulezeda.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/takaxerunop.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/29qp9kpip6bi1p340v9i99hgs1/40241187363.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/93625690827.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/b712q2ehrg006odl823j0vvt0d/93993072302.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/96aguj1cl0s9gofkn5u0t1s4q4/sumisipotasevekozegop.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/12928452506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=caecum+meaning+in+englishPDF 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_off0000d879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD879 19264 bytes
SHA-256: ee25ed66f69bbc599cef83cf58a46ca7d76d7790930a3c6bc769dbf937e84016
font_01_sfnt_off00010960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10960 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12177 10492 bytes
SHA-256: fea1cb8c68c0e25929ecb9fc12a9403249773151d73b42a30db51e7515c899e6

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