Malicious PDF — malware analysis report

Static analysis result for SHA-256 577153fb82303b26…

MALICIOUS

PDF

68.7 KB Created: 2021-09-09 06:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 634d688f40307f705b67325d0d5d525f SHA-1: bf6fa9a7232fe631b8c219e7832efea256566d7a SHA-256: 577153fb82303b269edac58eecae24ce82d14794db2a47c255acef147c7e3a78
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2639

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 http://ceramkgres.ru/userfiles/file/ginuvajaxujime.pdf In PDF document text
    • https://cuichi177.com/uploads/files/202108311849067097.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/vunakijunikoxexev.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/kozozivu.pdfIn PDF document text
    • http://zkpower.net/upload/files/54815505282.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/26076085034.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1631087642.pdfIn PDF document text
    • https://birudongker.com/contents/files/48762029998.pdfIn PDF document text
    • http://superazs.ru/images/news/file/42386900245.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/ganubalogo.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/39212542232.pdfIn PDF document text
    • https://scalping.ir/data/files/file/81618147515.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/15775159168.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/borufogusofu.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/bejadukomukaloxotik.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/53446814990.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/jimirufasuwarorolezena.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137124863d11---mojedumorotuzewebiwabari.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210907113045637873.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a1ac12912---degoxopobavozenat.pdfIn PDF document text
    • http://teraval.cz/res/file/midedotoxadosiduzujemofe.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/45453061496.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/83254891717.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/56e6fe345cdc691366ca7ffa3550ad86/suxefipafawopovazul.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/39485360559.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/37736775195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=iphone+11+personal+hotspot+not+workingPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7E 10712 bytes
SHA-256: 65ea6117055b5a5943f2e641a8dff252d67ee860825009844d4f968254b533fc
font_01_sfnt_off0000e72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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