Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff8ea9494aa938e…

MALICIOUS

PDF

85.5 KB Created: 2021-09-06 15:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 48504ad8c30d3104074985540c2b532c SHA-1: 93d3dfaa0add5680e157c20497630a0045d3010f SHA-256: eff8ea9494aa938e082ee84ec48d9ca7ec621bec71bec27711cae4b9741aee30
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 other PDF files hosted on potentially compromised websites. This structure suggests a link farm designed to lead users to malicious content, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tonghuichem.com/upload/files/14613110239.pdf In PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125d44511086---tunovuxunamilobav.pdfIn PDF document text
    • https://eniedu.com/data/file/20210904095244.pdfIn PDF document text
    • http://robedecreateur.com/img/files/88958619428.pdfIn PDF document text
    • http://shopexpert.com/app/webroot/files/userfiles/files/zuvoxifijagulaz.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbaa019136---pisixamedus.pdfIn PDF document text
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/20343934476.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/31983502888.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/navefuvalizobixexaveriz.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/59529415965.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b68fc94bdb2---93141412851.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/050435422884.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/lamakiketefizafekeda.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/f0e1705f8ab1d2788982d75cf0c18de5/79072418511.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/55816762763.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc390debc7---penefebemipoleru.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/bowugaxijej.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae1ec6d4f---16852209814.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/db3tlaa4lhh8jaikci3rbt37on/fusewixorumeveniv.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/revapuni.pdfIn PDF document text
    • https://topupdana.com/contents//files/difowuwebasusajufapaxil.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-3/20210503225017332919.pdfIn PDF document text
    • https://birudongker.com/contents//files/15145924478.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f89396b483f---37788896904.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=work+party+book+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_off0000e9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D7 10288 bytes
SHA-256: a903b1a7ada3dbd08b6218ae3ce34423578e7df5ca9ac25c553bcc2b6c7dbbd7
font_01_sfnt_off000100ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11901 18240 bytes
SHA-256: 019ec8116e322c81d824581821c57a395ed08da95c16cf655f97f6b9c8c084e9

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