Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd67c598c4c8f2c…

MALICIOUS

PDF

83.6 KB Created: 2021-09-07 08:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 544f104c6f8e9f9983b3a586f32e5d4e SHA-1: cac809e37a425b26b78ef9b52fd7495dea6fbc35 SHA-256: 7fd67c598c4c8f2c8e5775b9d700714f5a2b18563e6fbde010d3913b4d8cf6e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is used as a lure, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 https://drafthe.ru/uplcv?utm_term=bernardo+kliksberg+esc%C3%A1ndalos+%C3%A9ticos+pdf PDF link annotation
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ad5f755f4---37863202389.pdfIn PDF document text
    • https://12waktu.com/contents//files/99303906353.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/pudezogiluroxopo.pdfIn PDF document text
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/fisobivusorutojomexaditov.pdfIn PDF document text
    • https://webmenuplus.com/images/file/milulejixifojotinizu.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///97986626158.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16133a5ce5c7fc---favajajo.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d37d85db4---sixazudidazetom.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/xiwisib.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/lekesofifapujupoda.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/gotitadadivoret.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/95330303067.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/fcc24914549dc545fd534e45cb1a4333/kaboxojuk.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/761493fb85e3db3f4b8ef48e77a1379d/peperefazeko.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5862d8a084---motosavovaduwujogevutiba.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/40250206955.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/i8074r4n7cdvbjav00ufmcnuj2/xomaxesoruvajuduzavo.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/80129304823.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/bc44e6e3e170c507178f1cbd21f3365e/17579194926.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/sipugilozolikunu.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/108fd0a169f392a9936222bba9f70227/bonegomavamuwiza.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/8ee2lghfleo33u24lf4vf3tu2o/bivatoba.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/97198858106.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/52053444143.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_off0000dc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC24 11412 bytes
SHA-256: e4da1b11ee36af0ad6df7eedad183ae2ff29b36d13311f6537fd433ff110bf56
font_01_sfnt_off0000f60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60A 19292 bytes
SHA-256: 43aa2580f348a44bc16579c846c2d372dad3a754c857dbce36d1556b38c48c02
font_02_sfnt_off00012685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12685 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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