Malicious PDF — malware analysis report

Static analysis result for SHA-256 077361b49a91418e…

MALICIOUS

PDF

80.0 KB Created: 2021-09-03 01:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0568c8c28e4cc8282f5d7a036112e018 SHA-1: 660cc08a39ab59078c5a10fbab9fc4107ef0e675 SHA-256: 077361b49a91418e858a167dcd7355e4a0baf49883999947f8555f2863391602
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or malware distribution attempt. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=free+cursive+name+handwriting+worksheets PDF link annotation
    • http://goref.ru/files/file/15904262553.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/fodevawixurumiparuj.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/xalumukem.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/27669314220.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/b7eaf572817b6a0e40459e5703299fb4/kuzefobiduso.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/ef36a84edbca9321982b031928bd357d/4569119778.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/wotukeg.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/8508822105.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2452d6efed---remadatasejediruzut.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/1dc2f99cc69759514c2e5801ab312ee0/60692460739.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210629124332.pdfIn PDF document text
    • https://suksesunited.com/contents/files/45318874483.pdfIn PDF document text
    • http://chamdure.com/DATA/files/33168997221.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/10913614237.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/95053a54814daf7858266b52fdf11453/xazopunixik.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/26964903999.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607785848f267---33108881630.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/76351225361.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/guwosekumezep.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/jizududigowonidod.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/nhlvnffc182h09muikgbl6v727/26960708506.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/25593942577.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/8ord8v955spj5e20gjcs0rek89/46501247837.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/6bd03d5478ffae868085a9f4ad133369/tojekaradefujo.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/magolez.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_off0000d226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD226 17884 bytes
SHA-256: b16e63d6991cf52e7663bfdc8efb8e2d57d1f18bec28e324fed26ae0e6275147
font_01_sfnt_off0001006b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006B 11092 bytes
SHA-256: 3ba88d45f9cc8075a7de4123cb43de475417aff98aaef4da2c546f3e3b7b30c8
font_02_sfnt_off000119f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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