Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f66123be2121975…

MALICIOUS

PDF

69.6 KB Created: 2021-09-20 10:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 67ec317721876ee1573d20c986ec16da SHA-1: aaf81e1b592df2486bf5271bb033aa94e678362d SHA-256: 0f66123be2121975c81b99f3962b677d56c1ad2e66aabcb5480b2fe582b16f91
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting sites. The presence of these links suggests the document is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://goang-hann.com/uploads/files/202109022323021822.pdf In PDF document text
    • http://hoangle.vn/uploads/userfiles/file/lenamosixumija.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/nofedirer.pdfIn PDF document text
    • https://ubranni.com/uploader/files/14824850253.pdfIn PDF document text
    • http://eichler-kammerer.de/24858319872.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420846aee08---pojixujaniwujumumevex.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/97442688561.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/bogebobejanabisamokexap.pdfIn PDF document text
    • https://rosycaffe.com/file/lapafaganobosawulidisaxud.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/fc178747n74f0asdh4792ro4u3/28440556015.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210916041912.pdfIn PDF document text
    • http://centronegozi.com/public/supujiludejow.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/kometeforelo.pdfIn PDF document text
    • https://salwangurugram.com/files/pawupinin.pdfIn PDF document text
    • https://dukupahit.com/contents/files/17647393807.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/kifumu.pdfIn PDF document text
    • http://indemo.pl/Image/files/ziwasiwoji.pdfIn PDF document text
    • http://klemanpince.hu/files/file/36481542876.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea008734ab---nedifapadakasikob.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/131227472500.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/tuwebemereb.pdfIn PDF document text
    • http://cpviettin.com/upload/files/zemerizezuxofosavibenefo.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/wapewobiwobi.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/64389845141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=android+9+dragon+ball+zPDF 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_off0000b4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A9 10376 bytes
SHA-256: cc56cb170bc16b637150ed052d0b8730a3e6c4851d70c885528a9cfc6fa7be3c
font_01_sfnt_off0000cbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFB 14824 bytes
SHA-256: e1fcf9d21b15ff1273e89df3d1c49e1aece6331c95612af7f3c95ae993839669
font_02_sfnt_off0000f101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF101 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1