Malicious PDF — malware analysis report

Static analysis result for SHA-256 9622eec2a8145cc5…

MALICIOUS

PDF

75.0 KB Created: 2021-09-09 15:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 92b6158610b80b3db8b7effacc0a1744 SHA-1: f1fc8c1d250d240ff1d3e36e03eca0ca65a4bd83 SHA-256: 9622eec2a8145cc510388a3aa8ab6334cb20ab275b76194ee0fb6fa7a8efc9c9
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites hosting other PDF files. These linked PDFs are likely designed to lure users into downloading further malicious content or engaging in phishing activities. The presence of multiple compromised CMS upload links suggests a coordinated effort to distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://huntic.ru/uplcv?utm_term=tutorial+splash+screen+android+studio PDF link annotation
    • http://erbamedica.org/userfiles/files/ketojusebanav.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc4364aa5b---nagut.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139cb705fbe3---43577141370.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b436579992a97d17e3ae3769beda6a45/tovegopu.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/muwatozita.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/lufexefunep.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/jamazasad.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/gukazobogozulumofun.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/65552185497.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/34745361678.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210902120552.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/42677259925.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/kemekixuxokonufapujag.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/vulolixi.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/toxafe.pdfIn PDF document text
    • https://dabanbep.tanglehadong.com/upload/files/52343976109.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/17b16f5ecce8fe997c0fc4a83a70f0ac/10907976745.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/jizakosozadukoxakelimol.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/gujopizunepobebipoxeno.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/kozako.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/joduzotapu.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/98463126098.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/nusojivilufoxobupika.pdfIn PDF document text
    • 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_off0000c011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC011 10672 bytes
SHA-256: c7f4ffce3c0da033f41da8eb10e48689914aca47a892bbaa6b78b8baada690b3
font_01_sfnt_off0000d879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD879 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08B 17740 bytes
SHA-256: f885a794b95181b6a5d2704bf0dfac4b4c33d5215a106b6795d27ee7c8cac547

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