Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f09940717b1b0ff…

MALICIOUS

PDF

81.3 KB Created: 2021-07-03 14:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5d1d45762538388d018c454d22e30971 SHA-1: fb183282ee0b975b007b5d79ecec9f191df87f1b SHA-256: 0f09940717b1b0ff7d84e3398ffb5ed0021593ef308453ed8daadd85a3747e8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The embedded URLs are likely part of this distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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 http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8757e4d4c---70826289016.pdf In PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce568c9c0a4---salagolazanufi.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/dewipotitavijilodigagix.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/kjc4qf53b04l9n3dsb89570uu7/gemod.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070971846921---30928957406.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c437ec776---nosadeg.pdfIn PDF document text
    • https://ebooksweb.net/files/file/20699050034.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/dujosofo.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/39263388095.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/xupovaz.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/bekeresof.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccb5498fcb---darevumozuzoxeligavano.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/domit.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/8fd78b0df870d74fe4f712c0f2c18656/janakedimanotokexomezorev.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe9d83ad69---duzefomevogiso.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/95267701963.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8c8d78667---30840508059.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/r574f3th05ehdsifhdj7rfb4mj/70870286524.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/47523171505.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/7d9cd31db6a8ad99b3468e1abe7c457e/56798398272.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/602923929.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/a9sd5qpacv8o073p7s4qtqg91o/kosigabopumudaviziwimidet.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/pevutowetiritano.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160de74a830912---jawexaxo.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16095c1584742c---19408205367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=point+s+tyresPDF 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_off0000dc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6C 17304 bytes
SHA-256: 569965f3454b37c084b439feac8bfefc79bbf5b86931a9095809cbec4640cf2f
font_01_sfnt_off000109c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C6 10008 bytes
SHA-256: 743567cfcdd0cbb73b8fa334aef80b8cd0414fae33317e2d4672edde017c4eda
font_02_sfnt_off00012028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12028 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1