Malicious PDF — malware analysis report

Static analysis result for SHA-256 29ebdb299dc33c90…

MALICIOUS

PDF

98.6 KB Created: 2021-09-15 12:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0727ba84709bf2e0b91309c763ad4836 SHA-1: ec644e434db95771df2d2b0295c6405c6a7c04f5 SHA-256: 29ebdb299dc33c90bb12519bc1d14f6b6bd4dee7da2465df4d57dee418e041e3
126 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 embedded URLs pointing to potentially compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the true destination or evade detection. The presence of external URIs and compromised CMS upload links further supports the malicious intent, likely to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4477

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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=discord+talk+video+apk PDF link annotation
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/moxefigefapuzuzusiw.pdfIn PDF document text
    • http://marketingnews.fr/images/file/xenowuzaruwaroromewo.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613113c72ae46---fapesumemegobexi.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161390916d9cf7---wavugu.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/90755663910.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/80502409267.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/65006897304.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb3b46f45---rabiwapavexabozomilupumez.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/48035994420.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/bumejujoxevekewaxev.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/13236427276.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/82862860965.pdfIn PDF document text
    • https://path.mn/userfiles/files/xefazetemesetuledexarog.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/tikavidufulor.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/55637256846.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a131cfb21---basipijemenujepusoxin.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/40869725772.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/kuzabopazagolusenudoja.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/38807591222.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/jojujugatorafupoligakil.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16137cb2b138d5---98114243424.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/17448622214.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/57018973375.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/88926058328.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/potiwijunu.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12220 10564 bytes
SHA-256: 9ea5595559953d901eb8e8b15420a51f70450cac10523e136600b12de87372db
font_01_sfnt_off00013a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15271 20160 bytes
SHA-256: 9cc59d7f14d94bf596f39d23ee13ac005f98e09cfbc3b71c249d41766f713f31