Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0472d259947b495…

MALICIOUS

PDF

68.3 KB Created: 2021-09-29 00:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 72d488512b983a643a71d2c66e086d0d SHA-1: 91714e27247c0cb71e791587816b32aaaa186c29 SHA-256: a0472d259947b4951ecdbd9f47f246b9fc90b2b4f54fb16af33ae137952d1740
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://chcial.ru/uplcv?utm_term=kakamanga+app+for+android PDF link annotation
    • https://farmacieitaliane.com/documenti/file/mexajedozekodokuxure.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/vogekuximolu.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/40254675947.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b31d358cb---xafiv.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/22231814428.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/6aab4f355955700f7262edb9e3490c9c/nisovegavumogaxokeludava.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/28602531385.pdfIn PDF document text
    • http://xycrusher.com/d/files/xosamisavumetulinawut.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109081706185293.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/1404888005.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/16503861080.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/31145401424.pdfIn PDF document text
    • http://saint-party.com/media/file/folikajipekefa.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021961011282180.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/wabapot.pdfIn PDF document text
    • https://latework.cz/soubory/zajetuxatev.pdfIn PDF document text
    • https://www.canoe.ro/Extras/ckfinder/userfiles/files/mobujerupuretiv.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/376695516.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/fukatitikepivenizuwewa.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/37227902148.pdfIn PDF document text
    • https://loyd.rs/images/file/94762144268.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/80785668433.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/b470e18bbfb326a2a1dcbb08debf3c32/bipav.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_off0000ad1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD1D 15304 bytes
SHA-256: 9fe7d49e326eb50e912790d20b41167b6d186a770697f70fa940b5dac09d320e
font_01_sfnt_off0000d2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D9 10480 bytes
SHA-256: 9ae5830afd45639dc488c4dddb95648e0ded83c769c3f53d35609b0ae27987d9
font_02_sfnt_off0000ea56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1