Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5aa26c14a7eae7…

MALICIOUS

PDF

114.8 KB Created: 2021-07-07 09:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5aff3285b439990b78ecdf79e1dcfc2b SHA-1: adba091b99cba743b680dc98627e905e2c3695d7 SHA-256: 0c5aa26c14a7eae7dfc62ea6174621c9eed30254a03f1c60d8a73a28250501ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple compromised websites, many of which host other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's part of a larger phishing campaign, potentially using embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085e616704c4---mivizigunuvanuvexiriza.pdf In PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/i3ffmn4km0ie2m5fhk5t1eleg9/89551115782.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/67d8q9jmng9or3hglfdi3hg8e0/fezijabotenupimumukum.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/f30d9a8a80982f00d5c6ba5a653f976a/natezovasusakov.pdfIn PDF document text
    • http://dzbnf.com/upload/file///8050090670.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/72183786166.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098307177ba2---xapiwesivumaxutusesutu.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/libumemuwoseralejojekelux.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ad1582aed---41892954037.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160888c7813ca4---63396170066.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/88f25be041174c2a1073bb702b404299/xabazilupekodetorixoz.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a57833037a---13352738944.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/f56db71edd6ea5514737e406dc1ef37e/kegazeremata.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/faghs2uhvadk0an459h28c1p3n/82631960358.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/tevajobakape.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a6d9e8d68---puvoxoviboguv.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e447396b5b0---33349857645.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608c74e249aab---29903680699.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/nifero.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/93ae95f1a2924c2e3866d2e0253327f7/8851623815.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076efbc97d2d---bivivanipi.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8d1dd8ac9---lijit.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/821872264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=cumulative+list+of+notices+to+mariners+june+2020PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off00015c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C83 18348 bytes
SHA-256: f67115742d1e2d09d66efaaaeadfd74315a167959368ac6b1565949f82a13331
font_01_sfnt_off00018be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3FC 11068 bytes
SHA-256: 3682dac3076595b42e6b5e5442a92e320084d49f1505bccd00f95075c517f0d6

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