Malicious PDF — malware analysis report

Static analysis result for SHA-256 92dc4cec52cc0794…

MALICIOUS

PDF

76.9 KB Created: 2021-09-02 06:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3c8c29ce46605fbab0c1f4e00f3cab1d SHA-1: 801983aba41bae1e7879c15dfb3c59a71143e6f7 SHA-256: 92dc4cec52cc079496d63c694b165185e213b5a06c921ecf8f4c42e87e94dcb2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or are part of link farms designed to redirect users. Heuristics indicate a 'PDF link farm' and a 'compromised CMS upload link', suggesting the document's primary purpose is to redirect users to malicious or compromised sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://coretry.ru/uplcv?utm_term=most+gain+stock+today PDF link annotation
    • http://comp-art.ru/userfiles/file/negimi.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/setaloxakosor.pdfIn PDF document text
    • https://quaint-house.com/47297079904.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/femebimepolakoperekimo.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/megebit.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16114c98438ec2---58758799584.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/jivigufowobopil.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/071faf4b51ac2c632d9ce9fd9fc762f1/5306096253.pdfIn PDF document text
    • https://wonkingchina.com/d/files/sojebusunupa.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/nimevipodolaxotikajoja.pdfIn PDF document text
    • http://marblobaths.com/app/webroot/img/files/99863742821.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/44786996121.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612780912f18e---bujuzototogapavofomemivi.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/2pdrlh8o7nd0mii0oaf8toe56n/dijoxuniwuvetopu.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b7b96b456---gifejabelof.pdfIn PDF document text
    • http://camwater.org/media/files/25386985992.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/7849cb6fe4250f5e814b454261181e54/84961556038.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/lmpebqajq9ugjh5kaiqmrj9h84/50151776997.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/gelelejemefawedeb.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/rifevere.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f15a0a40fe---filaxoz.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/3587cac91dfdb87255ce162ec86e2890/xufax.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/tuwagawiwow.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/kd4rvranarj46sh6vpbgqk2db0/xefixeguvobigolilo.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_off0000c768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC768 18252 bytes
SHA-256: 3cee92ff713b518f733c06234bd2cf81e103b8c35b0bcd41d1a2abbb11dab7e0
font_01_sfnt_off0000f76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F84 10468 bytes
SHA-256: 63410de763dd811ef1c09ee43a74ae56d62c833f0bfe484a380312016077990d

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