Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef85537c4fbbfa2…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 03:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a4d6d461ec4ab0a87cc3446d5a0f6136 SHA-1: 98ef612c0e6dcafe5d5a369054bff3cd15617f5e SHA-256: 7ef85537c4fbbfa2432f666dbf136b015c0c835e84ebe275c99fe6b680a03a23
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains numerous links to external websites, many of which appear to be compromised WordPress installations or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to decrypt a password-protected archive, a common tactic to bypass gateway security. No scripts were extracted, but the presence of multiple external links suggests a downloader or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://speedwayinfo.hu/uploads/file/bivukobalexav.pdf In PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/13325997328.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/xesokavuxobifoziziw.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/xofewijowef.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/161334f2937795---9034529308.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/32859311045.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/06d4ecd10d8034720ea2629521fdbdfe/85686611078.pdfIn PDF document text
    • https://adikmanis.com/contents/files/bexufagogabunugaridafij.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/21ffd1091f15dbc7d54d8ccfcef7b98f/52411822062.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/90687139327.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/waleresavazul.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/82899433352.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/satitiseno.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/lekur.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/99130127815.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/15054588276.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/diredovoteworiw.pdfIn PDF document text
    • http://holzweiss.at/kasivixubaba.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/jevofafevuta.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/milapa.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/45094258656.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/porunipilutafukazuma.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/56075427861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ajpw+item+generator+no+passwordPDF 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_off0000d245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD245 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA57 18524 bytes
SHA-256: 171b6d72a52feadc22d6a6c7ebbab8fbb707c87f9f21c6d65fc0dabe3851b190
font_02_sfnt_off00011a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A61 10884 bytes
SHA-256: 3d47ac2da2aad58795e267db93261c8e52c9eba6f581e12ecff366ebcad2c2af

Open this report in the interactive analyzer, or submit your own file for analysis.