Malicious PDF — malware analysis report

Static analysis result for SHA-256 381419ed277bf725…

MALICIOUS

PDF

82.9 KB Created: 2021-09-11 08:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9cbfc1b4a15171e11f2e3c5ddd006ed6 SHA-1: c52b6c950fc3da0cfd73362502206701c8faa227 SHA-256: 381419ed277bf7250334b332dd7eaae4607e0a54df12e6309fdc411b732106a5
156 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of using compromised content management systems and SEO manipulation for malicious redirection. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://grupafurman.pl/!mag2011/userfiles/file/19131471928.pdf In PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/zawuram.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/b07d3c31a16d347f6f717abe95b84445/35441149858.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/14702327319.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c10726e04---fuzejavesipifeli.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/nivosoli.pdfIn PDF document text
    • http://geose.ru/userfiles/file/jilijuxuzava.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/40922518479.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/22161302088.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/tekafokewo.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/zitozoji.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/tonuxesuvifudadobo.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/zedalatat.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/202193144597980.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/vosolokol.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/duvuvuxuvaxupofipasu.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/5366422579.pdfIn PDF document text
    • http://maihome.hu/admin1/file/38896847382.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/lugagodetepedefa.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16136fabedb469---wopaset.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/ralapimo.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/xulilavimasosebemosa.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/lomewuzixatebi.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/4b18e44d44f0d06f2851212304cd1985/guwilomagujimujaxofiko.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///56877492707.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/68cf6ec7bed706cf050a9c4e233edc65/pevuvuloj.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/jiros.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/koxemajovanujege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ohms+law+practice+problems+worksheet+with+answers+pdfPDF link annotation
    • 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_off0000d7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D0 11228 bytes
SHA-256: b0efb0ea175af81b301d804b3d8ee0346dd43042f4746b9d222c5b41fa8cca7f
font_01_sfnt_off0000f1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CC 19924 bytes
SHA-256: 74ebde8cbf21ed1df8f07572fa1c573cd1f46b6ae1277f79db79da2c4e9c0075
font_02_sfnt_off000124e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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