Malicious PDF — malware analysis report

Static analysis result for SHA-256 8956ed573522e103…

MALICIOUS

PDF

87.0 KB Created: 2021-09-12 14:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5cd04d8e9e776621a114d8f96fc68433 SHA-1: 0eb66cd3015465c3a44c4a4e84af190ac12665ec SHA-256: 8956ed573522e1033e56a86ea733efbbbe6aeaf1e2a28c3e466edecfd350c742
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads or disposable domains. The embedded URLs and the nature of the heuristics strongly suggest an intent to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/rimejojafebig.pdf In PDF document text
    • http://wwsm-us.com/files/file/kajibufitodokipivotok.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/tibekakerodaweruvegumo.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/23744948851.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/ul36vsn2ctn2kjinmc62bnk0a9/japamavunagazukilozezi.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/96803970282.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/bumuzakirovoropodaganax.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/jibinedizejogoxolav.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210901175527.pdfIn PDF document text
    • https://anjingliar.com/contents/files/rewawazonagi.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/wifubefokejoloj.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/gijenixexufirit.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/6m3uv1lfphjia4debuej6kb0g3/burijuwiketujitulesu.pdfIn PDF document text
    • https://loyd.rs/images/file/86604295162.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/mazezikasatovo.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbed8abcca---98613699910.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/98383508102.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/78017898105.pdfIn PDF document text
    • https://km2804.com/ckupload/files/14641079998.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/60829796166.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/maresizexedetotuv.pdfIn PDF document text
    • http://gibisch.info/files/files/98130637221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=root+android+11PDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/45447259178.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_off0000f0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E2 9992 bytes
SHA-256: ce3306250fc3d3d781f5c437bc98749432ff9ff978095b9a14793a96adb80bac
font_02_sfnt_off00011f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F29 18576 bytes
SHA-256: 14450480cbcf15f0a1f44274ab1c517b4b9df8c9347a70a81075a91d24546a28