Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9015fd68b2ef325…

MALICIOUS

PDF

82.3 KB Created: 2021-09-04 06:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5891ab48d1074577bdcd715d0d1bb0e2 SHA-1: 71a3c7005dabdb23f185adf0e221c5438f126f4c SHA-256: a9015fd68b2ef3258b1e81ed1c85753fa4ab04063b2a1c85ff7b5ae2b651f8c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The PDF structure and embedded URLs suggest it is used as a lure to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philabc.ru/uplcv?utm_term=smircich+1983+pdf PDF link annotation
    • https://manuscripthandler.com/userfiles/file/72366150285.pdfIn PDF document text
    • http://nwmanagement.ru/generic/uploaded/file/mivofi.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/ced54bdc0f513b1a3611231c4a79c510/zixilogar.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/xenesavusozo.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/561b65jc1o0ggosrcvbkomc1jj/88589113436.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/wewukutepelupedo.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/8264688282.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/todaxanulilujazavomejunej.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/20131078671.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/77ea48558139a5837bfc62e06b79936e/51575544784.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/61506023975.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/70bf36bef763ead8b88cad7da265206b/zagumuzovekaxil.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/25qehf0rqurk89pj7iqpem3k16/72676498638.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/fixota.pdfIn PDF document text
    • https://emprenderem.cl/files/sozutamabosebotoled.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/padafujin.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/77512096315.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/60399847546.pdfIn PDF document text
    • http://schokozentrale.de/idata/41871028723.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3a755aa96b---99709856048.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/mofanajizurinapenixexokeg.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/jobatutagiwa.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210531_8D6F65E912A29585.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_off0000d756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD756 19848 bytes
SHA-256: 536f72e0cf61cdec06f2d671f7f4f275414e9f9cacbe8f291ff6a725c7c43629
font_01_sfnt_off00010ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122ED 10728 bytes
SHA-256: b3c25fab9c4d1c0bf9f4f4583d7d3fb2ac938730ae917f72ee60582c9363d938

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