Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce516e6b47439bf0…

MALICIOUS

PDF

79.1 KB Created: 2021-08-29 07:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 58fb843da4038a29207111a88f4bf816 SHA-1: e3a283f1a7d261ecc802ea745b96ed8e29304553 SHA-256: ce516e6b47439bf04ba253ad9dc9f6a4e4f3a7cd9650c73992e548bdfa08bf7a
96 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to disposable hosting and compromised CMS upload directories, indicating a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a link farm designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cee1af05000---30243914039.pdf In PDF document text
    • http://jingyitech.com/uploadfile/5837960265.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/zezose.pdfIn PDF document text
    • https://businesslife.com/content/file/vimovig.pdfIn PDF document text
    • http://52963566.com/upload/file/202108220749589702.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/92f87jlbkk2b0hnet4ehls0jh2/fipepizekibufa.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/vc87u2pbi8hojphnd2k3ooem5i/70408835021.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/51788959225.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/44d6d456fbd7a137fbf40b0102b3033f/sokukuditujarinovo.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16092ab6112cbf---gavibenopagudodabo.pdfIn PDF document text
    • https://ubranni.com/uploader/files/fusasikuz.pdfIn PDF document text
    • http://i-dron.cz/data/file/fawekoxibuxira.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/9b33bf42e7efbc381d06052b32c72339/refozakuketoparefatu.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/13115967694.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/81769521762.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/498ec4c73a65f1075ae4620b03a46065/sejakezobogulak.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16085744a9c5eb---xonozuboxarog.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/jopikonoti.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160fafe262bda1---33003348622.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/97a14b5bffc1e7452c4502f0f3b0b7f6/14861978389.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/sejozefibive.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/nizike.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/munojigidegejisugojel.pdfIn PDF document text
    • http://ttc-investco.com/img/files/81673733980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=fractional+distillation+of+crude+oil+pdfPDF 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_off0000d0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C8 17144 bytes
SHA-256: e68cc27a6d4c4337661a6c951f94794bae0a415446ba471649d8ac88dc41bd82
font_01_sfnt_off0000fcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EA 10688 bytes
SHA-256: eb0f45319b58d46b7112d2f27383badc8f3164e851ce5e92fd1b389435d7707a