Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa052a988a33646f…

MALICIOUS

PDF

75.3 KB Created: 2021-07-01 16:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 660213fbc959962b29ad1cca565d1628 SHA-1: 548d2811985c8b74308c8d65b36be51d8756aea8 SHA-256: fa052a988a33646f8e5eddc4bbdd88a86e33057273e74643989db024f88acf5a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. The presence of multiple external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://xn--vb0b83rba554gca.kr/page_data/file/20210523204838.pdf In PDF document text
    • http://aroma--style.net/files/files/21841389461.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/zuvusuwebudaxufuxali.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/12746053788.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/1e8f4393791e7d3f7c4477468cd8eb89/53099542683.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/sevijogerod.pdfIn PDF document text
    • http://kbchina.de/upload/sukubigokunume.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/jiresinidanobusovuzu.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7ff4209b---21865131475.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/8e36a6b79be66c59e8bf7b5e143d8e37/43917511819.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607b0e4eecc8c---rokazanituzat.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/7a4204f1c445173d710d5b7970cddfa9/lupabuzasolefijejibux.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/5acab5ac1413d19558f360595ce9616b/5319021690.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609f32af32abd---92071568065.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/54643996395.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/lvhabuvj4plun1vpgjpf50tttl/8291338972.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d748562a6d---65333147126.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/sosivegij.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/82701080480.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/98778710086.pdfIn PDF document text
    • https://silverwayshipping.com/userfiles/file/rosunakal.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/36540839509.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7e65ad4d5---purovu.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aee8e0bd7c4---50759191479.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b099ccd6a5f---rivogujik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=why+do+you+want+to+work+here+customer+service+answersPDF 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_off0000c40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40A 16104 bytes
SHA-256: 8288536176845319b61ac264e4ce9ef2cef5a174ff983938725d84b8844b9f60
font_01_sfnt_off0000edb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C7 11040 bytes
SHA-256: 9d7bce97def2db583ace8a9f4db73eaac9784e42328f2f641c5f93700e7016bb

Open this report in the interactive analyzer, or submit your own file for analysis.