Malicious PDF — malware analysis report

Static analysis result for SHA-256 686826c5fd075f56…

MALICIOUS

PDF

87.4 KB Created: 2021-06-26 10:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1cc2735bc39b2cb118e5c09f8662b16c SHA-1: 7363f064a543551bf92f9925108321f571aa9162 SHA-256: 686826c5fd075f56c00ffe388f9bb7ce019149b7050917246811a28db130e7ef
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to external sites, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/757e72caa37b6730aa2e9ba0a76a70ac/1186673533.pdf In PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070723b687fd---fonababedufo.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cf665fc0e---nisisatesi.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160721c81345ba---61604436342.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/48988942100.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/24538828939.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/162408441714681314644.pdfIn PDF document text
    • https://la-klamm.org/Files/files/51436798275.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbe669d636---sajevezelogas.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830795e59f9---76798507892.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08171d9673---nuvajoluxajefamaneruwudu.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/47677355800.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/21231283265.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/80439836143.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f4e7dd35c---76857450194.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607d843b9ce71---fotalulomofavujemifeb.pdfIn PDF document text
    • https://actor-conseil.com/files/file/93669769425.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/zaxefusagokidefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=prolonged+inactivity+meaningPDF 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_off0000f13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10956 10724 bytes
SHA-256: 2352946714541676ac07c0013d3a75f9f5e4ef788588ddafb2a8ea4fbc4036bb
font_02_sfnt_off000121c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C1 17932 bytes
SHA-256: 2be0c3f748ce03fd0d87936e486a7c380f480a314e1a794593c7a564f2471f48