Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac4d9d9f25801d7…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 23:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: edd9cc059f94bbcbb022556765942ec5 SHA-1: 4853b2eec8750f551993ffe12beebc7145f3ca50 SHA-256: 1ac4d9d9f25801d7f7e39a531c8d6ff6c4b9d0f0b0799aff4316d62e6adeab02
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains multiple links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The presence of PDF_RANDOM_URL_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests the intent is to host malicious content or phishing pages on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://aiwcecckolkata.org/FCKeditor/file/wutozaxeganivuv.pdf In PDF document text
    • http://grafitym.kz/files/file/repepepapitugabifedun.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/jesebonok.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/78174735596.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/58831884532.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/91640794936.pdfIn PDF document text
    • http://princeverma.in/uploads/files/53726671013.pdfIn PDF document text
    • https://kawanmto.info/contents/files/renumoxu.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/49405009231.pdfIn PDF document text
    • https://harmony.im/userfiles/file/babobudutixalekexe.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/wewewifi.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/s73b07v83uknf41kj4mhgq9jhu/gilenuz.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/robexopotinevexagejuweg.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/70748044885.pdfIn PDF document text
    • http://erpos.sk/data/files/20563180582.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139dfe29fcad---wilatibizo.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/gubobarupigarox.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/59985346531.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/61831424496.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/44301816253.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/60323268045.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/h3f07n5ctd2arglhm7ac5bn8u0/22552625573.pdfIn PDF document text
    • https://educhina.mn/editor/files/21287459106.pdfIn PDF document text
    • https://cargobull.cz/res/file/fifavaxidapajum.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/vatutabilalililopomojuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=pretty+wallpapers+for+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_off0000dbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBE 10692 bytes
SHA-256: 28698bcfae1cef5a9d5cacd1bdc34ac51bc79120b77d613d7e8e6e810287a910
font_01_sfnt_off0000f470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF470 17852 bytes
SHA-256: 757d251b72d9702cd6d5122a2d5aae025155d3cd0b9dbc848a3f80df822939f3
font_02_sfnt_off0001231a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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