Malicious PDF — malware analysis report

Static analysis result for SHA-256 f436db1b462b20a0…

MALICIOUS

PDF

79.0 KB Created: 2021-09-12 21:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: faee5c6b08e17af8b28b087bd73e4d3e SHA-1: 95a88ad99127a74b9f17a29b209b7dc210cb9efd SHA-256: f436db1b462b20a051bb76625274d1ca143ddbc48201d257cdf2bf4cd7e070c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to compromised WordPress upload directories and disposable hosting. These findings suggest the document's primary purpose is to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/76974d5fe33e8e143a852681a9fab0f8/paposonuwik.pdf In PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/senowosujuzifaparebi.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/2125c0e3379648de51f5b06415a91be1/14917419525.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/pemuperisogipobuwilaroti.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/werenibutigejasez.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/pikisuzomupavijeguz.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210902075134_3gehgh.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/koziv.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161329aad7533c---tafavodu.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/rekasororexoxar.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/mifeli.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/10094880304.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/79770233527.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/rakozadamivokewu.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/rthm111vulle575nnpmbould8etgklct/94927116792.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/36667107993.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/9711756401.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021091008022348.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/tikogumefupuzapadiwijalu.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/63916365228.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/29174578192.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/40661868375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=iptv+pro+smartPDF 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_off0000d0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B7 18156 bytes
SHA-256: 4bcee4afd522ec8ffdecaa5137f97311333ce806c27365dbf1a7a60aba18b9b1
font_02_sfnt_off00011876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11876 10056 bytes
SHA-256: 274bb5f0aeededfcd2b86ab86ec0f937dd442d5c1e74203a1d9f37c7918a3b5f