Malicious PDF — malware analysis report

Static analysis result for SHA-256 b339e0041a65e3eb…

MALICIOUS

PDF

90.3 KB Created: 2021-07-29 21:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3130abfed4edcea4452b8f77ba786185 SHA-1: 2ea4d3b38b589a94c95f23cb0055300208731b7c SHA-256: b339e0041a65e3ebd32d1acc916806787ca3e1a93e8011783c82a883aaed230b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is intended to lead users to malicious content or further stages of an attack. No scripts were extracted, and the document body was unreadable, limiting the analysis to the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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
  • 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://kemenyseprosiklos.hu/upload/file/kesuponoguwazadotajurata.pdf In PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/21707535158.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd0bf00854---wokusumu.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/60569965348.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d34002c98---9985011153.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920f34140e9---44247505715.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/wuwiwomilazupag.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afec35ebb7f---vapumalurutukuzajipudom.pdfIn PDF document text
    • http://espokebar.com/uploads/files/zizalaxulurinorutodu.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/41055138708.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95ccc89a3d---gasigawesuvamex.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/jadapelazawiximana.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/99649ff6b95a89ca58c3f815896fe594/xozovujedirune.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9b193ce3e---kidozuropotaxosavufutegi.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/foriribepevelisedewixumuv.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d33928d32df---51535360258.pdfIn PDF document text
    • https://alyansdugunsalonu.com/userfiles/files/lajuseriminesorovupobakaz.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/kavorubumavejonemug.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/0a772bd0809ec7acec0743b663720fbd/69149571315.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbbc512390---kuxezapirurip.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16071a5a81df1a---53739902425.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/54840640683.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/gejitadelivove.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/kadoxix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=simple+mobile+apn+settings+android+4g+ltePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE749 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5B 17040 bytes
SHA-256: f59a24a0cd90c4b211e3226269e07893b5cb6d9cb7cde49f8bb0fbbff472dfe2
font_02_sfnt_off00012c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1D 11028 bytes
SHA-256: 9b122acc733886908be657474666139b1f28c25b24c233c515ec049df34700d8
font_03_sfnt_off00014545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14545 16224 bytes
SHA-256: dc06733fb1b3e8baa4303a7b234726769048d67753183ec25fed266cd0fe6b8d

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