Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7506865e119df11…

MALICIOUS

PDF

86.6 KB Created: 2021-09-22 20:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d8dfe1e1f4792ab42e0d38c819294d31 SHA-1: a1e731152d739f03853e5c368c90eaa47d96ee03 SHA-256: e7506865e119df11458879b42733090c9092957aefb775e4c602e316908a2c30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS uploads, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://atlonnuri.org/UpLoadImage/editer/files/74874661591.pdf In PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131d413e8743---50231910023.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d73cab8c9775fe5fbd0a8e90b917bd16/44794057662.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/rasezawiwosid.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/859d470607fcabf9e85c6fcc13326399/vezasirudijexemofe.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/xavejawek.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73183401357.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613b266c76bd8---nirugi.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/25731517146.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/19569405259.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614651d21d258---nobaxugupeguzeradebi.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210917012607276.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/tadewekitubejanasugubu.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/95476959673.pdfIn PDF document text
    • http://aurora-c.jp/files/files/92739756338.pdfIn PDF document text
    • http://finchamauto.com/pics/pebukuwiboladudivojukefu.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/80208335135.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/16509757640.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/38606179148.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/2580149331.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/83762448967.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/zijaropato.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/lezozixunezexawesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=internet+in+androidPDF 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_off0000edf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10607 9976 bytes
SHA-256: 41b5d4806da825e773d94cbaca6b920dacf64e50890aaff8a78a8538115b1ec0
font_02_sfnt_off00011c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C38 18744 bytes
SHA-256: 515539ab1b8aa577989e4c229878093b8790e3b092010b2fdf69ca01fb19f217