Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c762fefd1f5e00…

MALICIOUS

PDF

81.9 KB Created: 2021-09-12 08:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4d4fdb16ed87a75447bb8d13a635a32b SHA-1: acbd08cc3c2ca5104ddc2444b11cbfe23c8d026e SHA-256: 18c762fefd1f5e00bb4f1c8d75b17e2a4a0c8fe92fb1dd74323025454316daf3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://xn--aknmedcal-wpbe.com/uploads/file/zalididiruxapagovi.pdf In PDF document text
    • http://njchemland.com/upload/files/nukulurupak.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/57121200595.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/27190982498.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/47602814214.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/vades.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/nitad.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/nanuwojunewowatumazo.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/6705299842.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/87883503731.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/vokawab.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/3c5f8413d5dd686e3cafdfa2f63f5a58/87288458438.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/48019032731.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/zokozamejewepotegox.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/pivogalakalodawewexaw.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/javejudilikud.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/mokiju.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/40858374667.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/febojo.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210906144554007929c58m0.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133435357b60---gopunixovefasepogevapu.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/zijomixagetegugu.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/wibugoko.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/95207dbt7trtbcjjm1o76j9l79/1844015516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=recuperare+contatti+cancellati+su+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_off0000dbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 17300 bytes
SHA-256: 67ae7818bf6d7f0d747481edf7964a99f44b05d990c835cf23cbe6aa7e190128
font_02_sfnt_off000120fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FA 10652 bytes
SHA-256: a462782a4d6aba05ad36134d299368a1681b7ba6850982cabba88b0ed789acfa

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