Malicious PDF — malware analysis report

Static analysis result for SHA-256 709dd0d4bfc0562f…

MALICIOUS

PDF

73.2 KB Created: 2021-07-01 09:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 51bacfb708c568cbfee61313b2158b69 SHA-1: 08bef3ca5143af36f87359e4febcb31d3b979201 SHA-256: 709dd0d4bfc0562f41e670dc34c165dd5c23fafc3c116319b26537e940d70f68
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple external URIs and compromised CMS upload links points towards an attempt to exploit user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://coretry.ru/uplcv?utm_term=how+to+add+additional+page+to+pdf PDF link annotation
    • http://energo-winstal.pl/userfiles/file/56124268216.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/9ac011d61fe5aff9d4f30a4f9fc0ccca/womiragigebo.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/vokufuzofagusugeg.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1dbe5747e---32884838413.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/vizudexotimikoxatitofonow.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/20525139033.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d62c618e86b---41425438351.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/d857a5dd30581fb91d6fbc740b979764/34761571300.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/zexizizoxuwurunoreratu.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4ed32518b---72341945742.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/657f76b42f3c62fe07dc61b7dab13cbe/64597339826.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/xivefijemipobama.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/e0fcafd212fd1114aff3a53f1ed9071a/75784348156.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/7746255251.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/s0ji6um7864vj5pjb3hou15tmi/tizulebi.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf1ad27904---xesapiwumujidazitijitedar.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/sakakirofaled.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/kp7dov2gts0bhkkqabn2ke9tb1/47980460149.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/pumiziwogoperaf.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/xokefijanikinofemusag.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/75349221231.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607658b3d047f---niremevudekemedopeva.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_off0000bd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD83 10480 bytes
SHA-256: 93f46ef57009ac22089ddf490633fe66886b9e0f6a6ccec3079dab8c8e2a9005
font_01_sfnt_off0000d53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4C 16388 bytes
SHA-256: 20372d66376065db937357aa1ce896958f5e688f2b9252ebbcc19489191bca58

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