Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb386aa9b3a1af66…

MALICIOUS

PDF

119.9 KB Created: 2021-07-02 15:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a405a34ce5f0a7d9428e86254c1159ff SHA-1: a3a6ebd411ace3321bb629a30bb411a0dde6416f SHA-256: bb386aa9b3a1af66bc5b1b16148e6f56589de09685fa45de49b6091517654131
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm with numerous URLs pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farms on potentially compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608523b75a651---bowar.pdf In PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/pejapewodipo.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/81264929287.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/60236659001.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/d5dc9l0hn74hbl35v3q49933n6/zumopixalizimaxa.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/4e61c05f142c6d694b21fb5b03051cf8/18063740653.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9dde4f260---povod.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/34581862157.pdfIn PDF document text
    • http://hyundailed.com/upload/editor/file/betelefidi.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/46a94b7f9e06b3c10d7bdef24e7dcb53/25781101125.pdfIn PDF document text
    • http://blugarden.eu/file/89273440615.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/tpsuk2onsueqecvjm0ivud79ak/96942452085.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/3ctr7csjh460qjgcrvsimdpiad/63536251820.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/98147018405.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/c6d4bc4c276e18e95b57c0e6550eb16f/safofezozozenanazabeje.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/13876157431.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6287dd356---liketa.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083b2d58c799---88356432235.pdfIn PDF document text
    • http://usagimatur.com/files/others/waman.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e16679255070ef53a473e92f535b13cf/4703144380.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/j7p2ijekkk9oqs26966ri50rja/senojibaxajulidowimax.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/0032e86f11e46fccc0114b0aa17e4d02/69610291047.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/45608943865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=state+power+got+a+reservation+worksheetPDF 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_off00017265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17265 17092 bytes
SHA-256: 713b81b4ebb5d4acf9c9872e37ea943eee97bf210fe956f8e1c52ae3f4353826
font_01_sfnt_off00019f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F1D 10804 bytes
SHA-256: 198d729eabc6162f82d2fb7c60d666212cf00d866b78b490b0dc49fe138fed19
font_02_sfnt_off0001b7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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