Malicious PDF — malware analysis report

Static analysis result for SHA-256 805f43f8cddc0574…

MALICIOUS

PDF

65.1 KB Created: 2021-09-04 10:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3a8050697ee35740f8541f1e3e6560ae SHA-1: 3fefbe3c5d8353db8e869ea59ad0671af61c6e9e SHA-256: 805f43f8cddc0574d33fc1031aacc6dbc31723d16ee5608043b82b4bfa930aa8
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing pages or further malware downloads. The presence of multiple compromised CMS upload links and disposable hosting further supports its role in distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6906

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://synerhu.ru/uplcv?utm_term=unimac+hvlp+paint+sprayer+manual PDF link annotation
    • http://hasyo.net/files/file/zipelowafuzejisobuxo.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/volarapuzevol.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607616cd0e9a4---68569060683.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/d742c9a0c18a2bbb08cb911c2e145cd2/fomuxipigivu.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/zinuxovovoba.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/qkj1sfo6p5unnvrdm3udg85hak/26807775745.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/80437517502.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfc8ed5dfb---nurafomefasedaxutufix.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607495525b825---98806373374.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/14203567244.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfc7f31f67---setisoli.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/vemovusuri.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/96652760622.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d4e9cd07931131de8e9f93cd9e17e4c4/wutinematola.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/fimobixizovaru.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753ffb5b788---posakijinowasubuvepik.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/robozar.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/nupijurijugewobusikovo.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c6219e4e46f---12384014392.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/67845825812.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160870c81257c2---mitupaj.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210809_222604.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/dc8cb5ad4ba6fb86237059612d90048d/8464274245.pdfIn PDF document text
    • https://jucariicopilasi.ro/app/webroot/files/userfiles/files/betiwevelokizero.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DD 10808 bytes
SHA-256: 14b9d7b989cd36d455ee8e66e824b69715437d922b07af4afa679121d3876c6e

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