Malicious PDF — malware analysis report

Static analysis result for SHA-256 88685738304628e1…

MALICIOUS

PDF

81.7 KB Created: 2021-10-07 11:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5e6410bf3dd102ae4339828db9c12d57 SHA-1: 0f8e97705f12bdd43770db49f16eec53b7d7c821 SHA-256: 88685738304628e13bff81ce50614edc5e5c84ea94d6bbfeb7c7ef1b55c60b12
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous links to compromised CMS upload storage and disposable hosting, combined with a 'download button' lure, strongly suggests a phishing or malware distribution attempt. The ML classifier output of 0.9975 further supports its malicious nature. No scripts were extracted, but the overall structure and URL findings indicate a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=flac+to+alac+online PDF link annotation
    • http://kammerchor-lindau.com/file/68353951068.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/29947759102.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/5323785052.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/nelavisi.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161462655b77b3---66019714189.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/73ce64cc8c0f8d546a92a972a6d29f4c/wenakojutewag.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/meniz.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/nopifafetidon.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/5490185571.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/digodezitufezigubezo.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/rifuzebususos.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/tixufunenubirujemimopul.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/u73bdvf2ajm8rg774eu1v0tepe/razenavo.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/pemevuvosuvimix.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/nasotipunezige.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210917_0DFA9AB3C8C31911.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/65789586714.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/43940416264.pdfIn PDF document text
    • https://pindimana.in/uploads/file/77277195483.pdfIn PDF document text
    • https://rosycaffe.com/file/70672188594.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/webanudenu.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/judaxofixegagepefap.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/solezasatuzep.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/678e96e1594bb51e16ee00e6a0a0555d/durevaselivomij.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/38249868868.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_off0000d82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82F 19372 bytes
SHA-256: d0d08e1edbec712272de0740201114a2a4f8a33395e4a81be8442dbcd68eeab4
font_01_sfnt_off00010ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADE 9932 bytes
SHA-256: 2fa21aaab2b793fbdb6040e645ee9b01889498223cd964a8fe9442b04a37d0fd
font_02_sfnt_off000120ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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