Malicious PDF — malware analysis report

Static analysis result for SHA-256 f750e4eeb106f02f…

MALICIOUS

PDF

72.3 KB Created: 2021-09-06 02:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 2b3c7c1827b233b71844ce98795d3ad3 SHA-1: af1d97763e90b3eb18b71b34172c093f032eb54e SHA-256: f750e4eeb106f02f134441efa31d6e3501b89eee1fe2a9a3d5b2abbddc1559e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/8531706b507ee80a5909b1274133bc7f/dowoxo.pdf In PDF document text
    • http://fjzy18.com/image/uload/files/todefelexodigel.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/41189968976.pdfIn PDF document text
    • http://bscartridge.com/pic/ludiwavuzajavaxujezuvik.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/798613370c1cae35b425978825e71278/25965391426.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/0277bc40a84af93cd691521b5d9766cf/pitimibaba.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/71239946615.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/29861428266.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/e12251ad5dedcccf19e00d4b48b0ef25/69394679180.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/25928127240.pdfIn PDF document text
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/83400320270.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076115acd7ee---46834775537.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bece8116948---wivetenuwamojagusu.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/duzisomapinatez.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/52172838282.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/35745118197.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/68277159931.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e6b642e94---xuwofodekodo.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/02983ef043bfb3d8b24bfb294bf6e161/3755648368.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/bakovesamepugezifugamajed.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/56308666332.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/2l4fe4vbnce9j7e9p4mi4m9q3v/79076781321.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/95777834291.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/kiwebukuzabipejala.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/taperitesetukesikak.pdfIn PDF document text
    • https://greenways.at/userfiles/file/43617505150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=toro+power+shovel+model+38361+manualPDF 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_off0000b947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB947 11280 bytes
SHA-256: 7a197552d4f13ad9c47c502550188e5f078d646d3b1d8402cc7a86a25ba8420a
font_01_sfnt_off0000d3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B5 15528 bytes
SHA-256: b55d18594b64d1d1a61c33636353ebf137a8d3b6a2c6100a83b5a38fb4a7968b
font_02_sfnt_off0000fb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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