Malicious PDF — malware analysis report

Static analysis result for SHA-256 49e012d28c82a798…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 23:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dea1a5c23d4848e1cc01880a40c1b16d SHA-1: 1b8e6ec4759c4eb188546754105bbeab4e28aac4 SHA-256: 49e012d28c82a798021ccdfa74765cdf7ef9d9344cbf4644dd90159eecec23b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to potentially compromised or malicious sites. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sinarlangit1.com/contents/files/20574953328.pdf In PDF document text
    • http://briquettemachinery.com/d/files/xinadad.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/86864165410.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/metesajubakujejete.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/wugomulutitedidowikereji.pdfIn PDF document text
    • http://splogservice.ru/content/files/sezemumewuzoluzilexun.pdfIn PDF document text
    • http://pololanna.com/user_img/files/86495783737.pdfIn PDF document text
    • https://latework.cz/soubory/49245118028.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/5k4cv5m7jj39gp4mc0hdiononq/depiwipavoxupuxozalife.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/giluturixidexov.pdfIn PDF document text
    • http://it-hair.com/userfiles/novufepunenobeguxosim.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/63552890251.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/xepodu.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/xusem.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/vipurozebo.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/pbuldjfsqd3hc1j0aqjkgbj977/gigadolaferukuze.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/wuzet.pdfIn PDF document text
    • http://envigest.cz/upload/file/42458422437.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/191121834.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210910150448.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/tajinodifukubibomojok.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed0b7d008f---21635043837.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613e561b2a680---jebulobaveg.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/gapikubajofipilot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=quantitative+data+analysis+techniques+pdfPDF 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_off0000da41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA41 16520 bytes
SHA-256: a91e1b35e1749c7a4b4a096cabc99f9978f19f6a01607e7bd1d111181c47585b
font_01_sfnt_off000104f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F8 10980 bytes
SHA-256: 98f8a0ad1c8af793539882292ed2d80bc9955773573a104477aac9244ed1adf5
font_02_sfnt_off00011e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1