Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77437876a037a05…

MALICIOUS

PDF

71.5 KB Created: 2021-09-30 14:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c08a44ce3112b9328f8dfaa10d15998e SHA-1: ce55c7af47703a4a8bc25ef15d68ad84b02b6867 SHA-256: b77437876a037a05e3ae9172b4d188e7343746c6142b26a17667e74765645c7e
196 Risk Score

Malware Insights

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

This PDF file exhibits malicious characteristics, including links to algorithmically generated URLs and a link farm hosted on compromised WordPress sites and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

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 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://crysiq.ru/uplcv?utm_term=dual+sim+separate+contacts PDF link annotation
    • http://shengyaweb.com/uploadfile/file/2021091419223696.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/fewofu.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/c496c0f4a1175b7008ba378df06838d2/4071498923.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/3924129607.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/934454887.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/bitikegotibadov.pdfIn PDF document text
    • https://atiksigorta.com/files/butirusirogogozogeja.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210904_F251C8FCFB06B9BD.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/lodege.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210920231713.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/38883948809.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/buwum.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/tarepukoleni.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/56248508174.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/mapulusoxor.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/4aa713c23fb80eb9c581489b18c5402e/89581765319.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/15038111176.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/72945364725.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/wikapawegilezimejijudo.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/goxedowuwuvoguxusesizobeb.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/13380508375.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/61034257335.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cdaf430e20---livokizebotixufuriz.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/wokilidugim.pdfIn PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/24988030256.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_off0000b548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5A 16860 bytes
SHA-256: 2f429487366aeaa65f63af1a54f69b203f9599a749d918354a8ebbbfbbda4d55
font_02_sfnt_off0000f806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF806 10636 bytes
SHA-256: 8babf5ea92ab2d988e19f25d931b967b641e8324ec5034dacc47a7c9a213bee3

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