Malicious PDF — malware analysis report

Static analysis result for SHA-256 539a817fff53cdfc…

MALICIOUS

PDF

80.4 KB Created: 2021-05-18 16:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 365804316b17de35eb5ee27d6c3bb46f SHA-1: 6a8e9d746fc33057ea93ccde3d598a0dea41f0d0 SHA-256: 539a817fff53cdfce752a72df73bdc218aa58ef8738acc0246948d55618038fe
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious files. The document body, though partially garbled, suggests a lure related to job applications, aligning with spearphishing tactics. The ML classifier strongly indicates malicious intent, and the presence of embedded URLs on compromised CMS upload directories further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/2ffb937778ee7d24685b0b530312e891/7382545129.pdf In PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b98d3a0a3---22557237060.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095d62d51400---kazomuluwixexevadefevujo.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/ragofawixotigobima.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b779d92f64---24382719416.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16098cf19a612b---kanowalinef.pdfIn PDF document text
    • http://texmet.pl/userimages/file/79752967723.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091175bad56c---39472084388.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/55t55m322mmfo8ptt2cplrvi9k/dizipixebixijusilupijepab.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/fle22m057gaerqnsg47dv2un43/57137505921.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/oi4oua8gfdrt2k3ttmvvhm8o9b/83246150632.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+make+a+cv+for+job+in+banglaPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/ximituvisabenowesu.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5E 5416 bytes
SHA-256: bede33391cfaa1400a9c2f1994c45bd770e77efdfe211f7eba699ba669edd3da
font_01_sfnt_off00010dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD9 11104 bytes
SHA-256: 26471d52aba9d53c3cc5545b508b877f5afc611e284e9f2e632c714964c49a98

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