Malicious PDF — malware analysis report

Static analysis result for SHA-256 20bf93139d7fff60…

MALICIOUS

PDF

78.8 KB Created: 2021-09-06 23:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 065e745ad3f5faab1f53ded7fe97f182 SHA-1: 13e0b88be78e6e7993ba24e9759002fe4c3be5b3 SHA-256: 20bf93139d7fff609d26445ae48036a439394a3678af76e9fd4a2c78fcf23010
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress sites, likely intended to trick users into downloading malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing and trojan distribution intent. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4208

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://krisoc.ru/uplcv?utm_term=nitro+pdf+full+version+bagas31 PDF link annotation
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d3c9e0aa4---subun.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e469e0d14---21823931295.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/97346387253.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202108132059057259.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/71373422563.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/vivibelifusitiki.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160869093385a1---povofamemoxavuneneve.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/wuwadi.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/50732801836.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/47166799335.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/65559530434.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021043003175373499.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/megexejopavilexobaze.pdfIn PDF document text
    • http://ymmicro.com/files/files/15528281112.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/fipagemesubew.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/vumujupixesuzaxowiw.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/97058777852.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/c0drvaq8sel38pd4gf28t9mc9a/xexukapibujafis.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/1297819f43d656c7d20d52cb4b44323c/69802288546.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/24773847235.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/84753230336.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/tofixafuxinilafesuso.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/timufir.pdfIn PDF document text
    • 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_off0000e0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B5 17696 bytes
SHA-256: a0f7e3bd445f1fd43b6dac29231e145911bcbfdcd7dc9bcb59a841d45b13a2cb
font_01_sfnt_off00010ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE3 11180 bytes
SHA-256: 163e8ebd7014b17f96f29c6dd8aa25e47f72ade5dfdcb1454f2ca12de16da93f

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