Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c62eee76775caf…

MALICIOUS

PDF

89.6 KB Created: 2021-06-28 10:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ee57d638a86e737f8188a174cfbf40c2 SHA-1: df087c080207876235a7d152952e77b16d19d534 SHA-256: f9c62eee76775caf39ac67f50bc4ec3504d3a7f86df9b072db7a613c8de0f124
96 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised CMS upload directories. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to manipulate search engine results or redirect users to potentially harmful content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/rukolagad.pdf In PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97f0c215c3---xizapin.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607440d05dd6e---57894513177.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/28739511928.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf3ff93618---tejovedamapetesimo.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a67cb798a73---13500877675.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/i0rp7ur7pp9um620o3tue3g966/lexod.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/jolavisikunavor.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdaca58c45---45091947091.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16098dfcdd56a8---nuxilaw.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/kvhakfb4tsbtci9ok9pcqfthrm/tekazixado.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/palizuwesixogi.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/46078901456.pdfIn PDF document text
    • https://ratsimae.eemedia/contents/file/zoxowuresu.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/26114560804.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/31327786593.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/ueajd6a1toks6uqv68loj9onfn/wojagap.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16093280022961---jefakam.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed09519b9b---56481583029.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dd7a63d16---tekekanimoxewamuru.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6af759787b---96462018267.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/rezamululodebedopo.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/b7761d6fbf4572c8e657ab0a37d53fa6/78236397575.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/67304713862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=window+tint+allowed+in+texasPDF 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_off0000f59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59F 19716 bytes
SHA-256: b48d520012c7d7bc90a47656556f80229c9a09f3b8a4d9cc11f4ae965fe87b99
font_01_sfnt_off0001280d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14024 10324 bytes
SHA-256: 290abd646f647307e0c65f9fba8a46b59e23344ace8a9d1ddb6754f2a01b9d83

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