Malicious PDF — malware analysis report

Static analysis result for SHA-256 19619b2e9796e318…

MALICIOUS

PDF

69.3 KB Created: 2021-09-19 07:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20c981b64a45695925f3a7bfd60f2235 SHA-1: 240f0593a5324a1b339e4c08855de53ca19edcff SHA-256: 19619b2e9796e318fe938d023db92c4c2d994b3ac1f5e3a3d493a400d05b69a0
124 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 exhibits characteristics of a link farm, with numerous URLs pointing to external sites. Several heuristics indicate that these links are hosted on compromised CMS platforms or disposable hosting, suggesting an attempt to lure users to malicious content. The PDF's structure and the presence of external links strongly suggest it's used as a delivery mechanism for phishing or malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3323

Heuristics 5

  • 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
  • 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://rpdev.org/ckfinder/userfiles/files/dujinomomamoloxori.pdf
    • http://studiogeologicotrilobite.com/userfiles/files/2568150782.pdf
    • http://sunnyten.net/userData/board/file/jijedomifi.pdf
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/mibumoxob.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/30343905896.pdf
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/72453457968.pdf
    • https://bodymart.in/ckfinder/userfiles/files/56582236472.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b5ea18263---figomesud.pdf
    • http://dalnoboy.org/data/filestorage/upload/files/vemodejudinegewidig.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/6bef650fc04d331b389ea0856c98d494/xademagupavo.pdf
    • http://veewood.com/file_media/file_image/file/zavel.pdf
    • https://ceylinpin.com/calisma2/files/uploads/rogefumunotivabotalevogaz.pdf
    • https://viadagio.be/userfiles/file/patuzilegafexitozenekisa.pdf
    • http://vizugy.hu/uploads/files/files/23538248769.pdf
    • http://www.de.ruben.pl/ckfinder/userfiles/files/12457429474.pdf
    • https://matfreklam.com/calisma2/files/uploads/bomojedufurajidudeneve.pdf
    • https://deltarents.com/upload/ckfinder/files/zemejumuwufagi.pdf
    • http://ansing.nl/userfiles/file/jukojite.pdf
    • http://m-camper.ru/ckfinder/userfiles/files/larigapinukaguwasaginida.pdf
    • https://jewfri.kr/files/image/files/zugibewisut.pdf
    • http://kjphotocon.org/data/userfiles/files/82015467904.pdf
    • http://divodizain.ru/ckfinder/userfiles/files/31267599439.pdf
    • http://personnelstrategies.net/userfiles/file/rafarasa.pdf
    • http://nigerseedindia.com/uploads/93165173641.pdf
    • https://nk-sostanj.si/files/file/66888658050.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143949dd7d40---bonobawul.pdf
    • http://rszm88.com/upfolder/e/files/20210916055205.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cuteu+apk+unlimited+money
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d611.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD611 16792 bytes
font_01_sfnt_off0000ee28.bin
d7223fa37fb8a6f71bc5ddce210803f3d3118933a414e8ad67cd73e5fd582107
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE28 10624 bytes