Malicious PDF — malware analysis report

Static analysis result for SHA-256 0de143777d080131…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 14:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 35498a85bde4d7755a26e82e7d908409 SHA-1: d465b6d89a89e1516d5aa3416eb4d4c11f134ff5 SHA-256: 0de143777d08013185a1fb811e224006e03c0cca3c362a69879f0a898a338276
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm intended for phishing or malware distribution. The ML classifier also flagged this PDF as malicious. No scripts were extracted, but the presence of multiple external URLs indicates a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6181

Heuristics 5

  • 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=ubuntu+shrink+pdf+size PDF link annotation
    • https://bczenekar.hu/files/file/80220538211.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1630465214.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/81269545760.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/44432862738.pdfIn PDF document text
    • https://cecprint.com/images/file/55610796114.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/bidafekafidowobamanenifoz.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090423014755.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161354da4486a6---17896952075.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/90494683860.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/lusitufel.pdfIn PDF document text
    • http://cjpharmtech.com/upload/files/35768428060.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/17694446383.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/tisisi.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/polutu.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353f502aafa---99158550232.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/menomotumopoza.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/xelofobofarebemosufuwifil.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/66075502606.pdfIn PDF document text
    • https://duel.pl/userfiles/file/bovefexipiwokelijinati.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/dipuzutivolajudosezukukeg.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/daa5e27659a774d431009647996d0fa0/33360875327.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ce1490af2---89285679302.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/wagomakuwemunadepo.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/zivukus.pdfIn PDF document text
    • https://naves.cz/res/file/66359573981.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_off0000e32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32E 10664 bytes
SHA-256: 60d66a9304694ec7ca752b8cc220f55a9a9ca149b121fc84f3aff420fb3c54c1
font_01_sfnt_off0000fb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001136c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136C 18964 bytes
SHA-256: 14f98bdc226c8c6b964dfed67a835a8e70c7b5c397d8a65c0c5ff547be3817eb