Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ea90303db90929…

MALICIOUS

PDF

72.2 KB Created: 2021-09-17 17:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f25557eb15105a980d35e60b7ff256c5 SHA-1: 9679b8d1230fe3f59218d77f610040a8b9dadb0d SHA-256: 90ea90303db9092929e51ea84828b4b0b21dca01d7b8bf4a7cdebd66334d2cf7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various external URLs, some hosted on compromised CMS platforms. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to redirect users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pixomot.ru/uplcv?utm_term=psiphon+vpn+premium+apk
    • http://brianhaymore.com/images/e/file/vevazabupapopivupojivexaw.pdf
    • http://iscelenie.info/files/file/ligofusutekisa.pdf
    • https://inprovitbrasil.com/ckfinder/userfiles/files/5967672216.pdf
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210903_43E4063DBDDAD7C4.pdf
    • http://harc-ias.vn/Images_upload/files/22182112852.pdf
    • https://juvelyrikoscentras.lt/Files/file/jakigukib.pdf
    • http://havefuntogether.com/image/upload/File/lawesunisomojiwarawajefe.pdf
    • http://harmonie-avion.fr/actualite/files/96373791495.pdf
    • http://intertexmedical.com/userfiles/files/jijukovawigozurasaziwu.pdf
    • http://thebankcardservices.com/uploads/files/jokumozedenemumogame.pdf
    • http://massimosusto.eu/userfiles/files/70139361241.pdf
    • http://cautrucpalang.vn/webroot/img/files/nupuzojaweragibegu.pdf
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/wibow.pdf
    • http://avesta-hmora.boj.se/uploads/userfiles/files/11286984150.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142fa30338ed---wujivesilutefovavomun.pdf
    • https://felicityokolo.com/file/45513506660.pdf
    • http://studiorestagno.eu/userfiles/files/rabowokalabo.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/f7d8900059c6f5372c7d363bbabc0f93/vuvumasavasagasipafunuvi.pdf
    • http://avesta-hmora.boj.se/uploads/userfiles/files/digixebumov.pdf
    • https://priscar.com/documents/files/77379746457.pdf
    • http://cleangroupbd.com/ck/upload/files/75034192333.pdf
    • https://liho.cz/UserFiles/File/jinakanuk.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9b731dc0---3721423135.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b869.bin
7e46655669fae8a0cab5e39784a8877ae6bd0d40e034f3bd2104f0faa431add5
pdf-font-stream PDF embedded font (sfnt) at offset 0xB869 16564 bytes
font_01_sfnt_off0000e345.bin
2fe81e674d870112dc5e82092020ae2131250f5649da7f5f89ebcf1877903c35
pdf-font-stream PDF embedded font (sfnt) at offset 0xE345 10632 bytes
font_02_sfnt_off0000fb6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6F 16792 bytes